We think of the brewing process as divided into two stages or phases: the hot side and the cold side. The hot side is the cooking (or brewing) process, which takes place in the brew house. The hot side involves recipe design, milling, mashing, and the boiling of the wort and hops. The product of the hot side, the hopped wort, provides the food for yeast in the second phase, the cold side. The cold side begins as the brewer cools the wort, adds yeast, and fermentation takes place. Depending on the recipe, the yeast will metabolize roughly 50 to 80 percent of the wort extract, with the remainder
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