Start with RO water and add salt additions to mash water. Perform a single-infusion mash for 60 min. with 1.3 qt./lb. at 154°F (68°C). Vorlauf until wort is free of grain. Add salts to sparge water (with the exception of baking soda or pickling lime). Add acid to bring the sparge water to 5.6 pH then fly sparge at 170°F (77°C) until around 8 gal. (30.28 L) of wort is collected. Boil for 90 min., or until about 6.6 gal. (25 L) of wort remains. Whirlpool and chill wort to around 60°F (16°C) and transfer clear wort to fermenter. Add O2 and zinc and pitch yeast. Chill wort to 55°F (13°C) and ferment until fully attenuated keeping temperature below 62°F (17°C). Fermentation can take a while for this big brew, so be patient. Carbonate to 2 vol. (4 g/L) CO2 and enjoy with sticky toffee bread pudding.
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