Beef with olive

4 medium red potatoes, each cut into 8 wedges 1/4 cup water 1/2 red onion , thinly sliced 1 lb roast beef 1 pint grape tomatoes , cut in half lengthwise 9[...]

1 lb bottom round steak , cubes 1 tablespoon olive oil 1/2 lb fresh mushrooms , sliced 1 medium onion , chopped 1 garlic clove , minced 2 tablespoons tomato[...]