Add ham, white onion, peppers, Cajun seasoning, salt, brown sugar, onion powder, and minced garlic. Stir in flour and continue to cook while stirring until you achieve a dark brown color, a brown roux. Slowly whisk in 6 cups of fish stock, add slowly to help avoid lumps. Bring to a boil and use remaining 2 cups of stock to adjust for consistency.
Remove from heat and add the crabmeat. Set aside for use.
In a saute pan, over medium-high heat, saute shrimp and sausage.
Place shrimp and sausage over grits, if using, and top with crab gravy sauce.
*Cooks note: For home use it is more practical to use instant grits. Cook your grits first and do not be afraid to season to your liking. This is a main component to your dish.