Water, the mash
& the wort
The unglamorous engine room. Water is 90% of beer and quietly shapes its style; the mash is where grain becomes sugar. Neither shows on a label, and both set the ceiling for everything after.
Making sweet wort
Before there’s beer, there’s wort — and before wort, water and a mash. Click through:
You’ve met this in every craft course — sake’s koji-making, olive oil’s milling. Here it’s water chemistry and the mash temperature that quietly set body and fermentability. A brewer chooses a fuller or drier beer here, before yeast even arrives, and matches water to style the way classic towns were defined by their wells. Unseen, decisive.
Appreciate the engine room
Connect water to style
Recall the water lesson: hard sulfate water sharpens hoppy beer (Burton), soft water suits pale lager (Pilsen). Style begins in the water.
Explain the mash in a line
"Hot water plus malt lets the grain’s enzymes turn starch into sugar" — the same starch→sugar job koji does in sake. Say it until it’s yours.
Questions
Flashcards
Lock it in
From memory:
- Roughly what share of beer is water, and why does it matter?
- What happens in the mash?
- What is wort?
- How does mash temperature change the beer?
- Why call water and mash the "invisible half"?
The boil &
fermentation
Where wort becomes beer. The boil fixes bitterness and cleans the wort; fermentation makes the alcohol and the character — and is where most faults are either born or avoided.
From wort to beer
Two steps turn sugary wort into finished beer. Click through:
Two payoffs here. First, attenuation is the whole alcohol story: the yeast eats sugar, and the drop from original to final gravity is the ABV. Second, most of beer’s off-flavours are born in a rushed or unhealthy fermentation (Sessions 2, 9). Clean fermentation is most of clean beer — which is exactly why the unforgiving lager is such a test of a brewery.
Trace the alcohol
Read the ABV as attenuation
On your beer, treat the ABV% as "how much sugar the yeast turned into alcohol." Higher ABV usually means a bigger or drier beer.
Link a fault to a cause
If you’ve met a buttery beer (diacetyl) or a cooked-corn one (DMS), connect it back: fermentation or boil. Cause, not just label.
Questions
Flashcards
Lock it in
From memory:
- Name three things the boil accomplishes.
- Why must the wort be cooled quickly before pitching?
- How does ABV arise (what is attenuation)?
- Where do most off-flavours come from?
- Why is clean fermentation "most of clean beer"?
Conditioning, packaging
& the enemies
The finishing steps — and the course’s freshness clock. Beer, unlike wine, mostly wants to be drunk fresh, and three enemies (light, oxygen, heat) are constantly trying to ruin it.
Finishing, and the three enemies
How beer is conditioned and packaged decides how it survives to your glass. Click through:
Here’s the block’s practical lesson, the twin of olive oil’s freshness clock: most beer is best fresh, and three enemies degrade it — light (skunk), oxygen & time (stale cardboard, fading aroma), and heat. Hop-forward beer is the most perishable of all. Buy fresh, favour cans and brown bottles, store cold and dark, and drink IPAs young. Only a few strong malty styles reward age.
Audit your beer
Find the date
Locate the packaged/best-by date. For an IPA, anything more than a few months old has already lost aroma. Freshness is a feature you can read.
Check the package
Note the vessel: a can or brown bottle protects it; a clear or green bottle (especially under shop lights) risks skunk. Store what you own cold, dark, and upright.
Questions
Flashcards
Lock it in
From memory:
- Which package best protects beer, and why?
- What causes lightstruck (skunk), and which bottles risk it?
- What does oxidation smell like?
- Should most beer be aged or drunk fresh?
- Which rare styles can improve with age?