Bring 3 cups of water to a boil in a medium saucepan over high heat, covered. Uncover and slowly whisk in the grits, 1 teaspoon salt and 1/2 teaspoon pepper. Reduce the heat to medium low and cook stirring occasionally, until thickened, about 5 minutes. Stir in the Parmesan and 1 tablespoon butter. Remove from the heat and season with salt and pepper. Cover to keep warm

Meanwhile, season the shrimp with salt and pepper. Melt the remaining 2 tablespoons of butter in a large skillet over medium-high heat. Add the shrimp, garlic, and cayenne (if using), and cook, tossing, until the shrimp are pink, 3-4 minutes. Remove from the heat and add 2 tablespoons water, the lemon juice and parsley; stir to coat the shrimp with the sauce and season with salt and pepper.

Divide grits and top with shrimp.... Enjoy