Thinly Sliced Ribeye Steak I

Ingredients (Serves 4) 1 lb (450g) ribeye steak, thinly sliced (partially freeze for easier slicing) 1 medium onion, thinly sliced 1 green bell pepper, thinly sliced (optional, for a modern twist) 1 tbsp vegetable or olive oil Salt and black pepper, to taste 8 slices provolone chees