Heat olive oil in a large skillet over medium heat. Add sausage and cook until browned, breaking up with a spatula; drain. Add green pepper, onion, garlic and seasonings; cook until vegetables are tender. Stir in vinegar and marinara sauce, if using; heat through. To serve, spoon sausage, pepper and onion onto buns.
Tip: Just for fun, spear a cherry tomato or a tiny sweet pickle with a long toothpick and use as a garnish for overstuffed sandwiches.
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