Beef Tips with worcestershire

2 tablespoons olive oil 4 lbs sirloin tip roast , trimmed and cut into 1-inch cubes 1/2 teaspoon salt 1/2 teaspoon ground black pepper 2 tablespoons butter 4[...]

2 lbs cubed lean stewing beef 1 small onion , chopped 1 (1 1/3 ounce) package roasted garlic gravy mix, for steaks 2 tablespoons soy sauce 2 tablespoons[...]