Heat oil in skillet. Add flour. Stir until roux becomes dark brown.
In another skillet brown beef and pork. Add onion, bell pepper, garlic, onion tops and parsley. Saute until vegetables are wilted. Add chopped oysters, salt and pepper to taste. Add roux and simmer on low heat 20 minutes, stirring occasionally. Set aside and cool.
Stir biscuit mix, red pepper and salt together with fork. Cut in shortening with pastry blender or 2 knives. Sprinkle water until dough can be worked into ball. Divide in half. Roll out very thin, cut into 3-inch rounds. Place 1 tablespoon meat filling in center. Fold in half. Crimp open edges together with fork. Bake on ungreased sheet in preheated 375F oven 20-25 minutes until golden brown. (Can also make 1 9" pie)