Duhallow Cheese and Grits Soufflé

Add milk and 2 1/2 cups water to a heavy, medium saucepan; bring to a boil over medium heat. Whisk in grits, and simmer 10 minutes, stirring constantly. Reduce heat to the lowest setting possible; cover and cook until grits are creamy and tender, stirring frequently, about 1 hour (time will vary depending on grits; add hot water if they are getting too thick). Preheat oven to 350 degrees F. Transfer grits to a large bowl and cool slightly. Stir in butter and cheese; season to taste with salt and pepper. Stir in egg yolks. Using an electric mixer, beat egg whites with a pinch of salt to stiff peaks. Fold into grits. Transfer to a large buttered ovenproof dish and bake until golden, about 45 minutes. Serve immediately.