Beef with salad

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[...]

1/3 cup Wish Bone Italian salad dressing 1/2 cup dry red wine or 1/2 cup vegetable broth 1 1/2 tablespoons light soy sauce 12 ounces lean boneless sirloin,[...]