Mix everything but the ketchup together in a mixing bowl. Using your hands is best so you won't overmix but you can also use a mixer if you don't like touching the meat.
Form into 6 patties, no more than 1″ thick.
Cook in a medium hot skillet about 4-5 minutes per side, until cooked through. Put some ketchup or tomato sauce on top of each patty, cover the skillet and cook 1-2 minutes until the ketchup is heated through.