In a large kitchen pot, mix corn grits and 5 oz. (141 g) of the 6-row malt with 3.3 qts. (3.1 L) of 159 °F (71 °C) water to make a cereal mash. Hold cereal mash at 148 °F (64 °C) for 15 minutes. While cereal mash is resting, pour the rest of the grains into your brew kettle and mash in to 140 °F (60 °C). Use about 1.66 gallons (6.3 L) of water for an initially thick mash. Heat the cereal mash to a boil, stirring constantly, and boil for 30 minutes. After boiling the cereal mash, add it to the main mash and adjust temperature with water to 152 °F (67 °C). This should bring your mash thickness into the normal range. Mash for 45 minutes, then heat mash to 165 °F (74 °C). Stir frequently, and expect the temperature to keep climbing a bit after you shut off the heat. (Any temperature under 170 °F/77 °C is fine). Recirculate until wort is clear, then collect about 5 gallons (19 L) of wort, sparging with water sufficiently hot to keep grain bed between 165–170 °F (74–77 °C). Add 1.5 gallons (6 L) of water and boil wort for 90 minutes, adding bittering hops for final 60 minutes. Add yeast nutrient and Irish moss with 15 minutes left in the boil. Cool wort quickly to 54–65 °F (12–18 °C), aerate well and pitch yeast sediment from yeast starter. Ferment at 54 °F (12 °C) for 10–12 days, then let temperature raise to 60 °F (16 °C) for a diacetyl rest. This should take about 2 days, but taste beer before cooling. Rack beer to secondary fermenter and cool beer to 32–40 °F (0–4 °C). Lager for 30–45 days.