Just The Recipe. Cook the beef until it is cooked through, using a utensil to crumble it as it cooks. Add the tomato sauce, tomato, oregano, powdered onion, brown sugar, mustard and Worcestershire sauce to the cooked meat. Mix thoroughly. Add the previously cooked veggies and oatmeal to the meat mix. Stir and cook for three minutes on medium-low heat. Salt and pepper to taste. Bun it up, and serve warm.