Preheat oven to 350 degrees F.
Butter an oven proof dish with 3 tablespoons butter and set aside. In a 6 quart sauce pan, heat 8 cups water to a boil. Whisking furiously, slowly drizzle in mixed flours until all are in. Pull pan to front of burner and switch to a wooden spoon. Cook until texture of molten lava and add butter and cheese. Stir though and pour into baking dish. Place in oven 8 to 10 minutes, remove and serve immediately.
Recipe courtesy of Mario Batali