Basic Beer

Part of Fermentation and Brewing

Brewing beer from raw grain is one of humanity’s oldest technologies, predating written language. The process transforms inedible starch into fermentable sugar, then converts that sugar into alcohol — a preserved, calorie-dense, pathogen-free beverage that has sustained civilizations for millennia.

Beer is fundamentally different from wine or cider. Fruit-based fermentations start with ready-made sugar. Grain-based fermentation requires an extra step: you must first convert the grain’s starch into sugar before yeast can ferment it. This conversion process — malting and mashing — is what makes brewing more complex but also what makes it possible anywhere grain grows, which is nearly everywhere humans live.

Overview of the Brewing Process

The complete process from raw grain to drinkable beer involves six major steps:

Step	Purpose	Duration
1. Malting	Convert grain starch reserves into accessible form; develop enzymes	5-10 days
2. Mashing	Use enzymes to convert starch into fermentable sugar	1-2 hours
3. Boiling	Sterilize, concentrate, add bitterness/flavor	1-2 hours
4. Cooling	Bring wort to yeast-safe temperature	30-60 minutes
5. Fermentation	Yeast converts sugar to alcohol and CO2	1-3 weeks
6. Conditioning	Flavor maturation, carbonation, clarification	1-4 weeks

Total time from grain to glass: 3-8 weeks. Most of this is passive waiting.

Step 1: Malting the Grain

Malting is controlled germination followed by kilning (drying). When a grain kernel germinates, it produces enzymes (primarily amylase) that break down its starch reserves into sugars to fuel the growing seedling. The brewer hijacks this process, stopping germination after the enzymes are produced but before the seedling consumes the sugar.

Suitable Grains

Grain	Suitability	Notes
Barley	Excellent — the traditional brewing grain	High enzyme content, excellent husk for filtering
Wheat	Good	High protein, produces hazy beer, less husk (harder to filter)
Rye	Good	Distinctive spicy flavor, sticky mash (difficult to work with alone)
Oats	Moderate	Adds body and smoothness, use as supplement (10-20%)
Corn/Maize	Moderate	Low enzyme content; needs supplemental enzymes from barley malt
Sorghum	Good	Primary grain for African traditional beers, gluten-free
Rice	Moderate	Very fermentable but needs enzyme source, produces light beer
Millet	Good	Traditional in many African and Asian beers

Barley Is King for a Reason

Barley produces the most enzymes during malting, has a sturdy husk that acts as a natural filter during lautering (separating liquid from grain), and its starch converts cleanly to fermentable sugars. If you can grow barley, use barley. If not, any starchy grain will work with adjustments.

Malting Procedure

Steeping (Day 1-2):

1. Place whole, unhusked grain kernels in a container
2. Cover with clean water at 50-65°F (10-18°C)
3. Soak for 8-12 hours
4. Drain completely and let air-rest for 8-12 hours
5. Repeat soak-drain cycle 2-3 times until kernels show a white nub (chit) at the base — this is the root beginning to emerge
6. Total steeping time: approximately 48 hours

Germination (Day 3-7):

1. Spread soaked grain in a layer 2-4 inches deep on a clean surface (screen, tray, floor)
2. Keep at 55-65°F (13-18°C) — too warm promotes mold; too cold stalls germination
3. Turn the grain 2-3 times daily to prevent matting and ensure even air circulation
4. Sprinkle with water if the grain begins to dry out
5. Germination is complete when the root sprout (acrospire) inside the kernel reaches approximately 75-100% of the kernel’s length

Checking Acrospire Length

Cut a kernel lengthwise with a knife. You will see the white acrospire growing from the base toward the tip, hidden inside the husk. When it reaches three-quarters to the full length of the kernel, modification is complete. Under-modified malt has fewer enzymes. Over-modified malt has lost too much starch to the growing seedling.

Kilning (Day 8-10):

1. Spread germinated grain thinly on screens or trays
2. Dry at low temperature first: 90-120°F (32-49°C) for 12-24 hours to halt germination without destroying enzymes
3. Then increase to 150-180°F (65-82°C) for 2-4 hours to finish drying and develop flavor
4. Higher kilning temperatures produce darker, more flavorful malt but reduce enzyme activity

Kilning Temperature	Malt Type	Flavor
150-170°F (65-77°C)	Pale/base malt	Mild, bready, high enzyme activity
180-200°F (82-93°C)	Amber malt	Biscuit, toasty, moderate enzymes
200-250°F (93-121°C)	Brown malt	Nutty, caramel, low enzymes
300-400°F (149-204°C)	Roasted/black malt	Coffee, chocolate, no enzymes (use small amounts for color/flavor only)

After kilning, remove rootlets by rubbing the grain in your hands or tumbling in a cloth sack. The rootlets taste harsh and astringent. Store finished malt in a dry location — it keeps for months.

Step 2: Mashing

Mashing is the process of mixing crushed malt with hot water to activate the enzymes and convert starch to sugar. The result is a sweet liquid called wort (pronounced “wert”).

Crush the Malt

Malt must be cracked, not pulverized. Each kernel should be broken into 3-4 pieces while keeping the husks as intact as possible. The husks will serve as a filter bed.

Crushing methods:

• Rolling pin on a hard surface
• Two flat stones (improvised mill)
• Wooden mallet
• Purpose-built grain mill (ideal if available)

Do Not Flour the Grain

Grinding malt into flour creates a paste that is nearly impossible to separate from the liquid. Crush just enough to crack each kernel open. If some kernels are uncrushed, that is better than grinding too fine.

The Mash

1. Heat water to 164-170°F (73-77°C) — this is called strike water
2. Mix crushed malt with hot water at a ratio of approximately 1.25 quarts of water per pound of grain (2.6 liters per kilogram)
3. Stir thoroughly to eliminate clumps and dry pockets
4. The temperature should settle to 148-156°F (64-69°C) after mixing — this is the conversion range

Mash Temperature	Enzyme Active	Result
148-152°F (64-67°C)	Beta-amylase dominant	More fermentable, drier, higher alcohol
152-156°F (67-69°C)	Alpha-amylase dominant	Less fermentable, sweeter, more body
156-162°F (69-72°C)	Alpha-amylase only	Very sweet, heavy body, lower alcohol

4. Hold this temperature for 60-90 minutes, stirring occasionally
5. Test for conversion: take a small sample of liquid and add a drop of iodine (if available). If the iodine stays brown/yellow, conversion is complete. If it turns black/blue, starch remains — continue mashing.

Maintaining Mash Temperature

Without precise temperature control, wrap your mash vessel in blankets or straw insulation after mixing. A well-insulated vessel loses only 2-5°F over an hour. Alternatively, apply gentle heat underneath, stirring to prevent scorching. The mash is forgiving — being 5 degrees off target produces acceptable beer, just with a slightly different character.

Lautering (Separating Wort from Grain)

After mashing, you need to separate the sweet liquid (wort) from the spent grain:

1. If your vessel has a false bottom or screen, simply drain the liquid from below
2. If not, pour the entire mash through a colander, strainer, or cloth-lined basket set over a collection vessel
3. The first runnings will be cloudy — pour them back through the grain bed 2-3 times until the wort runs relatively clear (this is called vorlauf)
4. Once clear wort is flowing, collect it in your boil kettle
5. Sparging: Pour additional hot water (170°F / 77°C) slowly through the grain bed to rinse out remaining sugars. Use roughly the same volume of sparge water as your original mash water

The spent grain is excellent animal feed, compost material, or can be dried and mixed into bread dough.

Step 3: Boiling

Bring the collected wort to a vigorous, rolling boil and maintain for 60-90 minutes.

Why boiling is essential:

• Sterilization — kills all bacteria and wild yeast that would produce off-flavors
• Protein coagulation — hot break material (protein clumps) forms and settles out, improving clarity
• Hop/herb extraction — bitterness and flavor compounds dissolve into the wort
• Concentration — water evaporates, concentrating sugars and flavors
• DMS removal — dimethyl sulfide (an off-flavor compound) is driven off by boiling

Bittering and Flavoring

Hops are the standard bittering agent in modern beer, but they are a relatively recent addition (widespread use began around the 12th century). Before hops, brewers used a mixture called gruit — a blend of bitter herbs.

Bittering Agent	When to Add	Character
Hops (if available)	60 min before end of boil for bitterness; 15 min for flavor; 5 min for aroma	Bitter, floral, citrus, pine — varies by variety
Yarrow	45-60 min before end	Bitter, medicinal, traditional gruit herb
Mugwort	45-60 min before end	Bitter, sage-like, mildly sedative
Sweet gale / Bog myrtle	30-45 min before end	Resinous, aromatic, traditional Scandinavian
Juniper branches/berries	30-60 min before end	Piney, resinous, gin-like
Spruce tips	15-30 min before end	Citrusy, resinous, vitamin C source
Dandelion root/leaves	45-60 min before end	Bitter, earthy
Wormwood	Small amounts, 15-30 min	Very bitter (use sparingly — large quantities are toxic)

Boilover Risk

When wort first reaches boiling temperature, it will foam vigorously and can boil over within seconds, creating a sticky, difficult-to-clean mess and losing valuable wort. Watch the pot closely as it approaches boiling. Reduce heat or stir when foam rises. After the initial foaming subsides (10-15 minutes), the boil will stabilize.

Step 4: Cooling

After the boil, the wort must be cooled to fermentation temperature (60-75°F / 15-24°C) before adding yeast. Speed matters — the wort is sterile but vulnerable to contamination. The faster you cool it, the less time bacteria have to colonize it.

Cooling methods:

• Cold water bath: Set the pot in a larger vessel of cold water. Change the water as it warms. Takes 30-60 minutes.
• Cold night air: In cold weather, set the covered pot outside. Effective but slow.
• Stream/spring water: Place the sealed pot in running cold water.
• Ice (if available): Fastest method — cold water bath with ice.
• Immersion coil: A coil of copper tubing through which cold water flows, placed in the hot wort. Cools in 15-20 minutes.

Step 5: Fermentation

Transfer the cooled wort to a fermentation vessel. This can be a ceramic crock, glass carboy, wooden barrel, food-grade plastic bucket, or even a large jar. Add yeast.

Yeast Sources

Source	Reliability	Notes
Saved yeast from previous batch	High	Harvest from bottom of fermenter
Commercial dried yeast	High	Store-bought, most reliable
Wild yeast (spontaneous)	Variable	Leave wort exposed overnight, then seal. Unpredictable results.
Fruit skin yeast	Moderate	Crush unwashed grapes or plums into wort
Sourdough starter	Low-moderate	Contains some alcohol-tolerant yeast among the bacteria
Dregs from unpasteurized beer	Moderate	Pour and swirl last inch of a bottle-conditioned beer into your wort

Seal the fermenter with an airlock (a device that allows CO2 to escape without letting air in). A simple airlock can be made from a tube leading from the fermenter into a jar of water.

Improvised Airlock

Poke a hole in a lid or stopper and insert a flexible tube (any food-safe tubing). Run the other end into a jar of water. CO2 bubbles out through the water, but air cannot flow back in. This setup costs nothing and works perfectly.

Fermentation Timeline

Day	Observable Activity
0-1	Lag phase — little visible activity
1-2	Foam (krausen) begins forming on surface
2-4	Peak activity — vigorous bubbling, thick foam, possible blow-off
4-7	Activity decreases, foam subsides
7-14	Fermentation slows to occasional bubbles
14-21	Fermentation complete — no more bubbles, yeast settles to bottom

Fermentation temperature should stay between 60-72°F (15-22°C) for ale-type beers. Warmer temperatures produce more fruity esters and fusel alcohols. Cooler temperatures produce cleaner flavors.

Step 6: Conditioning and Carbonation

When fermentation is complete (no more bubbling for 2-3 days), the beer is technically ready to drink — but it will taste young, rough, and flat. Conditioning improves it.

Bottle Conditioning (Natural Carbonation)

1. Prepare a priming solution: dissolve 3/4 cup (4 oz / 113g) of sugar in 1 cup of boiling water per 5 gallons of beer
2. Gently stir the priming solution into the finished beer
3. Transfer to bottles and cap tightly
4. Store at room temperature for 2-3 weeks
5. The remaining yeast in the beer ferments the priming sugar, producing CO2 that dissolves into the beer under pressure

Bottle options: Any pressure-resistant container with a tight seal. Glass bottles with crown caps, swing-top bottles, or even plastic soda bottles (which have the advantage of letting you squeeze-test carbonation level).

Bottle Bombs

Adding too much priming sugar, bottling before fermentation is truly complete, or using weak glass can cause bottles to explode under pressure. Use measured priming sugar. Verify fermentation is complete by checking that gravity readings (if you have a hydrometer) are stable for 2-3 days. Never use decorative glass bottles or containers not designed for pressure.

Bulk Conditioning

If carbonation is not desired, simply leave the beer in the fermenter (or transfer to a clean vessel off the yeast sediment) for 2-4 additional weeks. The flavor will mellow and clarify. Serve from a tap or ladle.

Grain-to-Glass Recipe: Simple Ale (5 Gallons / 19 Liters)

Ingredient	Amount
Pale barley malt (home-malted)	10 pounds (4.5 kg)
Water	7 gallons (26.5 L) total (4 gal mash + 3 gal sparge)
Bittering herb (yarrow, hops, etc.)	1-2 oz (28-56g)
Yeast	Saved from previous batch or wild-captured

Expected results: Approximately 5 gallons of beer at 4-6% ABV, amber color, moderate bitterness.

Key Takeaways

Brewing beer from grain requires malting (controlled sprouting and drying to develop enzymes), mashing (mixing crushed malt with hot water at 148-156°F for 60-90 minutes to convert starch to sugar), boiling (60-90 minutes with bittering herbs), cooling, fermenting (1-3 weeks with yeast), and conditioning (2-4 weeks for carbonation and flavor development). The process is more complex than fruit-based fermentation but uses grain — the most widely available and storable food source on earth. Barley is the ideal grain but any starchy grain works. Hops are traditional but any bitter herb provides the necessary flavor balance. Wild yeast can substitute for commercial yeast. The key temperatures to remember are: mash at 148-156°F, cool to below 75°F before adding yeast, and ferment at 60-72°F. With practice and patience, grain-based brewing is a renewable, self-sustaining skill that converts stored grain into a safe, calorie-dense, shelf-stable beverage.