Bring the water and sea salt to a boil in a small saucepan over medium-high heat.
Slowly whisk in the stone-ground grits, then reduce the heat to low and cover the pan.
Simmer the grits for 15-20 minutes, whisking occasionally, until the texture is thick and creamy.
Stir the ghee and nutritional yeast into the cooked grits and set aside.
While the grits cook, heat the olive oil in a large skillet over medium-high heat.
Add the diced bell pepper and red onion to the skillet, sautéing until they are softened and slightly browned.
Toss the raw shrimp with the Cajun seasoning and black pepper in a small bowl to coat evenly.
Add the seasoned shrimp and minced garlic to the skillet, cooking for 2-3 minutes per side until the shrimp is pink and opaque.
Spoon the creamy grits into a bowl and top with the sautéed shrimp and vegetable mixture.
Garnish the dish with chopped fresh parsley and serve immediately.