Step by Step
Mash in 15 qts. (~14 L) of water to get a single-infusion mash temperature of 153 °F (~67 °C) for 45 minutes. Sparge with hot water of 170 °F (77 ºC) and collect 6.5 gallons (25 L) of wort. Boil for 90 minutes. Add hops at times indicated and Irish moss with 15 minutes left in the boil. Cool wort to 70 °F (21 ºC), transfer to fermenter and top up to 5 gallons (19 L). Aerate well and pitch yeast. Ferment cool (60 °F/16 ºC) until complete (about 7–10 days). Transfer to secondary or rack with corn sugar and hazelnut flavoring. Bottle or keg as normal.