Kielbasa: Grill smoked kielbasa on a grill pan or outdoor grill over medium-high heat. Cook for 5 minutes per side and fully heated through. Remove to a platter and keep warm.
Grits: In a heavy bottomed saucepan or pot, bring the chicken broth, evaporated milk and table salt to a boil.
Add the grits in a steady stream, whisking constantly, until fully combined. Adjust the temperature to low and allow the grits to gently bubble and thicken.
Cook covered for 15-20 minutes until smooth and creamy. Stir periodically to prevent sticking. Add extra chicken broth when needed, to thin.
After the grits have reached desired consistency stir in the heavy cream (or half and half), butter and shredded cheese. Stir until the cheese melts. Remove from heat, keep warm.
Tomato Sauce: Meanwhile, In a medium size pot or saucepan sauté the diced onion in a couple of drizzles of olive oil. Sauté for 3-5 minutes over medium-high heat until onion is soft, translucent and beginning to brown. Add the minced garlic. Cook for one minute longer.
To the pan add the fire roasted tomatoes, seasoned salt, pepper flakes, oregano, basil and sugar. Cover and simmer over low heat for 10 minutes until tomatoes break down. Mix in parsley. Keep warm until serving. (The sauce will easily double.)
Serve: Slice the grilled sausages on bias. Spread the grits into a shallow bowl, top with sausage slices and drizzle with the fire roasted tomato sauce. Sprinkle with additional parsley and serve immediately.