Bring 3 1/2 cups water to a boil and stir in the Colavita Instant Polenta. Reduce heat to low, and cook for 5 minutes, stirring constantly until the mixture thickens.
Remove from heat, add the salt, cheese and Colavita Olive oil and stir until melted. Keep warm.
Heat 2 tbsp Colavita olive oil in a large skillet over medium heat and sauté the onion, pepper and garlic until softened, about 3 minutes.
Add the Colavita Diced tomatoes and thyme and bring to a simmer. Cook for 2 or 3 minutes.
Sprinkle the tomato mixture with the 1 tbsp flour and stir well.
Add the shrimp and stir constantly until they begin to turn pink, about 2 minutes.
Add 1/2 cup stock and cook for 2 to 3 minutes more.
Add the tomato paste and stir until blended.
Add the heavy cream, Worcestershire and Tabasco. The mixture should thicken and coat the shrimp. If too thick, add a bit more stock. Be careful not to let it come to a boil. Taste for salt.
Place a portion of grits in the center of each plate and spoon shrimp over or around it. Sprinkle with parsley.