To brew the Gordon Biersch Winter Bock, perform a decoction mash with rests at 104°F (40°C), 126°F (52°C), 144°F (62°C), 155°F (68°C), and 162°F (72°C).
Step by pulling 25% of mash, boiling for 10 minutes, and remixing with main mash to hit step temperatures.
Mash out at 172°F (78°C). Boil for 90 minutes.
Ferment for nine days at 48°F (9°C), lower to 43°F (6°C) for four days, then lager for two weeks at 39°F (4°C) and three weeks at 32°F (0°C).
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