2 pounds blade, sirloin, or round steak, trimmed
4 (6 inch) sub rolls, split lengthwise
2 Tbsp vegetable oil
2 onions, chopped medium
Salt and pepper
6 slices American or provolone cheese
Slice meat into thin strips.
Heat the oil in a 12-inch nonstick skillet over high heat until simmering. Add the onions and saute until softened and lightly browned, about 5 minutes. Add the sliced meat, 1/2 tsp salt, and 1/4 tsp pepper and continue to cook until the beef is no longer pink, about 5 minutes.
Place rolls on a baking sheet. Add the meat and onions. Place the cheese on top. Stick under the broiler until cheese is melted.