How to Make It
Bring water, whole milk, and salt to a boil in a medium saucepan over medium-high. Gradually whisk in uncooked grits; return to a boil. Reduce heat to medium-low, and simmer, stirring occasionally, until creamy and thickened, 25 to 30 minutes. Remove from heat, and stir in buttermilk and butter.
Cook sausage in a large skillet over medium until lightly browned, about 4 minutes; drain on paper towels. Stir cooked sausage into warm grits. Add Gouda, parsley, and hot sauce. Stir until Gouda cheese is melted and smooth.