Beef with dressing

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[...]

8-ounces medium bow-tie or shell pasta uncooked 2 tablespoons olive oil 3/4 to 1 pound beef for stir fry, cut into strips 2 to 3 inches long 4 cloves garlic ,[...]