Some great advice here.
my contribution is "It's pretty easy to control the 'hot' side of brewing, but a lot harder to control the 'cold' side which contributes 50+% to the result."
What do I mean by that? You can adjust the following on the hot side:
- grist composition,
- degree of crush,
- mash profile (single, step, decoction),
- mash temp,
- sparge temp,
- sparge type (batch fly)
- sparge amount eg volume or stop at a sg
- boil intensity,
- boil length,
- hop selection,
- hopping rate,
- hop timings,
- use of whirlfloc or similar,
- whirlpool,
- exposure to aeration ie HSA
- chill or no chill
h34r:
on the cold side you're basically limited to
- sanitation
- yeast choice
- yeast health
- pitching rate
- temperature control
- fermentation vessel design eg bucket or conical
- protecting the ferment from undesired micro-organisms
- time on yeast cake
- rack or no rack
- lager required?
- crash cool?
- packaging eg bottle or keg
The cold side of the process or elements of the cold side are often overlooked or not given the focus they should be, considering their contribution to the final product. As the production of beer relies on a "controlling" our favourite micro-organism, control of the cold side is critical.