Asado (Roast Beef)

2 pounds round steak
3 tablespoons vegetable oil
1 cup flour
1 small onion, diced
4 ripe tomatoes, diced
2 green bell peppers, chopped
1 clove garlic, minced
Salt and pepper, to taste

Heat oven to 325 degrees F. Pound flour into the steak, then season with salt and pepper. Brown on both sides in very hot oil. Add remaining ingredients plus 2 cups hot water. Cover and bake for about 2 hours or until tender.