In your kettle, heat 3 gallons (11 L) of water to 142 °F (61 °C), stir in grains and rest for 15 minutes at 131 °F (55 °C). Heat mash to 148 °F (64 °C) for a 30-minute rest then heat to 160 °F (71 °C) for a 15-minute rest. Heat to 170 °F (77 °C) and transfer to lauter tun. Collect about 5.5 gallons (21 L) of wort, add 1 gallon (3.8 L) of water and boil for 90 minutes, adding hops, Irish moss and yeast nutrients at times indicated in ingredient list. Cool wort to 56 °F (13 °C), transfer to fermenter and aerate. Pitch yeast from (cooled) yeast starter. Ferment at 56 °F (13 °C). Lager for 2 months at 40 °F (4.4 °C) or below.
(adapted from Chris Colby, 2006)
Alternative yeast strains: Wyeast 2042 (Danish lager) or White labs WLP850