half a small onion diced
package of sliced button mushrooms
1 tablespoon flour
salt and pepper to taste
Set pan to medium high heat. Pour some olive oil to cook the beef in. When beef is cooked, remove from the pan and place in to a bowl. Add some butter and cook the onion and mushrooms. Once the onion and mushroom are cooked and tender, add the beef back in to the pan. Add the flour and stir well, then add the sour cream and stir well. Salt and pepper to taste. Serve over pasta noodles or rice.