Roast Beef with mustard

1 (12 inch) whole wheat tortillas 1 large lettuce leaf 3 ounces sliced roast beef 1/2 tomato , diced 1/2 red pepper, diced 1/2 green pepper , diced mustard[...]

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[...]