Beer Brewing
Why This Matters
Beer is not a luxury — it is liquid bread. For thousands of years it was the safest everyday drink for entire civilizations. The boiling step kills every waterborne pathogen. The alcohol (even at 2-3%) inhibits bacterial regrowth. The grain provides calories, B vitamins, and amino acids. Egyptian pyramid workers were paid in beer. Medieval European monks brewed thousands of liters per year because beer was what kept people alive when the water supply was contaminated. If your community grows grain, beer is the most practical way to turn that grain into safe, nutritious, storable hydration.
Overview of the Brewing Process
Brewing converts grain starch (which yeast cannot eat) into grain sugar (which yeast can eat), then lets yeast convert that sugar into alcohol and CO2. The process has five stages:
- Malting — Sprout grain to activate starch-converting enzymes
- Mashing — Mix crushed malt with hot water to convert starch to sugar
- Lautering — Separate sweet liquid (wort) from spent grain
- Boiling — Sterilize wort and add flavor (hops/herbs)
- Fermentation — Yeast converts sugar to alcohol
Each stage is critical. Skip or botch any one and you get porridge, not beer.
Stage 1: Malting
Malting activates enzymes (amylase) inside the grain kernel. These enzymes break starch chains into simple sugars during the mashing stage. Without malting, the starch remains locked up and yeast cannot use it.
Grain Selection
| Grain | Malting Suitability | Notes |
|---|---|---|
| Barley (6-row or 2-row) | Excellent | The traditional and best choice — high enzyme content |
| Wheat | Good | Higher protein, produces cloudier beer |
| Rye | Good | Distinctive spicy flavor; sticky mash, harder to strain |
| Oats | Fair | Low enzyme content; best blended with barley |
| Corn / maize | Fair | Must be malted; often used alongside barley |
| Rice | Poor | Very low enzyme content; needs barley enzymes |
Barley is preferred because it has the highest natural enzyme content and its husk acts as a natural filter during lautering. If barley is unavailable, wheat is the next best option.
The Malting Process
Step 1 — Steeping: Submerge grain in clean water at room temperature. Soak for 8-12 hours. Drain and let rest for 8 hours (this air rest is important — the grain needs oxygen). Soak again for another 8-12 hours. The grain should have absorbed enough water to increase weight by 40-45%.
Step 2 — Germination: Spread the soaked grain on a clean, flat surface (a wooden tray, a stone slab, or a clean cloth on the ground) in a layer 5-8 cm deep. The ideal temperature is 12-18 degrees C.
Turn the grain pile twice daily — reach under and flip it to prevent matting, even moisture distribution, and heat buildup. Sprouting generates heat; if the pile feels warm to the touch, spread it thinner.
Step 3 — Monitor growth: Within 2-3 days, tiny white rootlets emerge from the base of each kernel. By day 3-5, rootlets are 1-2 cm long and a small white shoot (acrospire) has grown inside the kernel to about 75% of its length.
The ready test: Bite a kernel. It should be chalky, crumbly, and slightly sweet (starch is already partially converting). If it is still hard and glassy, continue germinating.
Step 4 — Kilning (drying): Stop germination by drying the malt. Spread it thin in warm, dry air or in a low-temperature oven/drying rack at 50-60 degrees C for 24-48 hours. The malt should feel dry, hard, and rattly when shaken.
Temperature During Kilning
Do not exceed 70 degrees C during kilning. The enzymes you worked so hard to activate are proteins — heat above 70 degrees C destroys them, and without enzymes, your malt cannot convert starch to sugar during mashing. Low and slow is essential.
Step 5 — De-rooting: Rub the dried malt between your hands or on a rough surface. The brittle rootlets break off easily. Winnow (toss in a breeze or fan) to separate rootlets from kernels. Discard rootlets (good animal feed).
Storage: Dried malt keeps for months in a dry container. This means you can malt in bulk during harvest and brew throughout the year.
Stage 2: Mashing
Mashing mixes crushed malt with hot water at a specific temperature to activate enzymes and convert remaining starch to fermentable sugar.
Step 1 — Crush the malt: Crack each kernel into 3-4 pieces. Use a mortar and pestle, a flat stone, or a quern set very coarse. The goal is cracked grain, not flour. Flour creates a thick paste that will not strain.
Grind Size Is Critical
If you grind to fine flour, the mash becomes a porridge that clogs during lautering. You will waste hours trying to strain it and end up with bread dough, not beer. Crack the grain coarsely — you should be able to see husk fragments and broken kernel pieces, not powder.
Step 2 — Heat water: Bring clean water to approximately 72-75 degrees C. You need about 3 liters of water per kilogram of crushed malt. This is called “strike water” — it is intentionally hotter than target mash temperature because adding the cooler grain drops it to the target range.
Temperature test without a thermometer: The water should be too hot to keep your hand submerged, but you can dip your hand in and out quickly (2-3 seconds). If you cannot touch it at all, it is too hot — let it cool. If you can hold your hand in comfortably, it is too cool.
Step 3 — Mash in: Pour the crushed malt into the hot water while stirring constantly. The temperature should settle to 64-68 degrees C — the “saccharification range” where alpha and beta amylase work together to convert starch to a mix of fermentable and unfermentable sugars.
Step 4 — Hold temperature: Maintain at 64-68 degrees C for 60-90 minutes. Stir every 10-15 minutes. If the temperature drops, add small amounts of boiling water to bring it back up. If it rises above 72 degrees C, add cold water.
The iodine test (if available): Drop a small sample of mash liquid onto a white surface and add a drop of iodine tincture. If it turns blue/black, starch remains — continue mashing. If it stays brown/amber, starch conversion is complete.
The taste test (always available): Scoop a spoonful of liquid and taste it. It should be distinctly sweet — like barley water with sugar. If it tastes starchy or chalky, continue mashing.
Stage 3: Lautering
Lautering separates the sweet liquid (now called “wort”) from the spent grain husks.
Step 1 — Build a lauter tun: You need a vessel with a perforated false bottom or a straining system. Options:
- A pottery vessel with holes drilled in the bottom, placed over a collection pot
- A basket lined with straw or reeds (the straw acts as a filter)
- A cloth bag placed in a frame over a pot
Step 2 — Transfer the mash: Pour the entire mash into the lauter tun. Let it settle for 5-10 minutes. The grain bed itself acts as a filter.
Step 3 — Vorlauf (recirculation): Draw off the first liter of liquid from the bottom and gently pour it back on top of the grain bed. Repeat 3-5 times until the runoff turns from cloudy to relatively clear. This clarifies the wort.
Step 4 — Collect the wort: Let the clear, sweet liquid drain steadily into your boiling vessel. This is the “first runnings” — the sweetest, most concentrated wort.
Step 5 — Sparge (rinse): Heat additional water to 75-80 degrees C and gently pour it over the grain bed. This rinses out remaining sugar from the spent grain. Collect this “second runnings” into the same vessel. Use about half the volume of your original water.
Step 6 — Combine: Mix first and second runnings. The combined wort is ready for boiling. The spent grain is excellent animal feed or can be added to bread dough.
Stage 4: Boiling
Step 1 — Bring the wort to a full, rolling boil in your largest pot or vessel.
Step 2 — Boil for 60-90 minutes. This accomplishes several things:
- Sterilizes the wort (kills all bacteria and wild yeast)
- Drives off dimethyl sulfide (DMS), a compound that tastes like cooked corn
- Concentrates sugars (evaporation reduces volume by 10-15%)
- Denatures proteins (reduces haze in finished beer)
Step 3 — Add bittering agents at the start of the boil. These balance the sweetness and add preservative compounds:
| Bittering Agent | Amount (per 10L) | Flavor | Preservative Value |
|---|---|---|---|
| Hops (dried flowers) | 15-30 grams | Bitter, floral, citrus | Excellent (months) |
| Yarrow (dried herb) | 20-30 grams | Bitter, herbal | Good |
| Mugwort (dried leaves) | 15-20 grams | Earthy, slightly bitter | Moderate |
| Heather tips (fresh) | 30-50 grams | Floral, mild | Moderate |
| Juniper berries (crushed) | 20-30 grams | Piney, resinous | Good |
| Spruce tips (fresh) | 30-50 grams | Piney, citrus | Moderate |
Without any bittering agent, the beer will be drinkable but cloyingly sweet and will spoil within 1-2 weeks. Hops are the best preservative — hopped beer lasts months.
Step 4 — If using hops, add a second smaller dose (5-10 grams per 10L) in the last 10 minutes of boiling for aroma.
Step 5 — Remove from heat when the boil time is complete.
Stage 5: Fermentation
Step 1 — Cool the wort: This must happen as quickly as possible. Hot wort is a paradise for bacteria. Pour the wort between two clean vessels repeatedly (this also aerates it — yeast needs oxygen to start). Alternatively, place the sealed vessel in cold water or a cold stream. Target temperature: below 25 degrees C, ideally 18-22 degrees C.
Step 2 — Pitch yeast: If you have saved yeast from a previous batch (the thick sediment at the bottom of a finished beer), add 2-3 tablespoons per 10 liters of wort. If you have no yeast, wild fermentation will occur in 24-48 hours — the same way all beer was made before the 19th century.
Step 3 — Cover: Place in a clean fermentation vessel. Cover with cloth to keep out insects while allowing CO2 to escape. Never seal the vessel airtight during active fermentation — the pressure will build and the vessel will explode.
Step 4 — Wait: Fermentation begins within 12-48 hours. You will see foam (called “krausen”) forming on the surface and the liquid bubbling actively. Primary fermentation lasts 3-7 days at 18-22 degrees C.
Step 5 — Monitor: When the krausen falls and bubbling slows to less than one bubble every few minutes, primary fermentation is complete.
Step 6 — Transfer: Carefully pour or siphon the beer off the sediment (called “trub”) into a clean serving vessel. Leave the thick yeast layer behind.
Step 7 — Save your yeast: Scoop the thick, creamy yeast sediment from the bottom of the fermenter. Store it in a sealed container in a cool place. It remains viable for 1-2 weeks and can be used to start your next batch — giving you consistent, reliable fermentation.
Recipe: Basic All-Barley Ale
For approximately 10 liters of finished beer:
| Ingredient | Amount |
|---|---|
| Dried barley malt | 2.5-3 kg |
| Water (clean) | 15 liters total (10L mash + 5L sparge) |
| Hops or bittering herb | 20-30 grams |
| Yeast (or wild ferment) | 2-3 tablespoons saved from previous batch |
Expected results:
- Alcohol: 3-5%
- Color: Amber to brown (depending on kilning)
- Flavor: Malty, slightly sweet, with herbal/hop bitterness
- Shelf life: 1-3 months (hopped); 1-2 weeks (unhopped)
Scaling and Planning
| Community Size | Weekly Beer Need | Malt per Week | Brew Frequency |
|---|---|---|---|
| 5 people | 20-30 liters | 6-9 kg | 2-3 batches |
| 15 people | 60-90 liters | 18-27 kg | 6-9 batches |
| 50 people | 200-300 liters | 60-90 kg | Continuous |
For communities above 15 people, a dedicated brewer and permanent brewery setup (large mash tun, dedicated boiling vessel, multiple fermenters) becomes essential.
Common Mistakes
| Mistake | Result | Fix |
|---|---|---|
| Mashing above 72 degrees C | Dead enzymes, no sugar conversion | Control temperature; add cold water if too hot |
| Grinding malt too fine | Stuck mash, impossible to strain | Crack coarsely — visible husk pieces |
| Pitching yeast into hot wort | Dead yeast, no fermentation | Cool below 25 degrees C before adding yeast |
| Sealing fermenter airtight | Pressure builds, vessel explodes | Use cloth cover; never seal during active fermentation |
| Kilning malt above 70 degrees C | Enzymes destroyed, malt is useless | Kiln at 50-60 degrees C; patience is required |
| Not saving yeast | Reliance on unpredictable wild fermentation | Always save the yeast cake from every successful batch |
Key Takeaways
- Malting is the key transformation — without it, grain starch is locked and yeast cannot work. Sprout, dry, and crush — in that order.
- Temperature precision matters at mashing — 64-68 degrees C is the target. Too hot kills enzymes. Too cold slows conversion. Use the hand test if you have no thermometer.
- Coarse crush, never flour — the single most common beginner mistake. Crack the grain; do not powder it.
- Boiling sterilizes — this is what makes beer safe to drink. The 60-minute boil is non-negotiable.
- Save your yeast — reliable fermentation from saved yeast is the difference between consistent beer and gambling on wild microbes.
- Hops or herbs are preservatives, not just flavoring — without bittering agents, beer spoils in days. With hops, it lasts months.
- Beer is food — at 3-5% ABV and 400-500 calories per liter, it provides hydration, energy, and nutrition. It is liquid bread, and should be treated as a staple food, not a treat.