Preheat oven to 350° F.
Soak tomatoes in hot water for 30 minutes. Drain and set aside.
Combine mushrooms, olives, red onion and dressing. Set aside.
Spread mayonnaise on focaccia. Top with tomatoes, turkey and cheese. Place focaccia on foil-lined pizza or cookie sheet.
Heat at 350° F. until cheese is melted and focaccia is heated thoroughly (about 5 minutes).
Top sandwich with mushroom mixture. Cut into wedges and serve with fresh fruit.
Per Serving: 533 calories, 21g fat, 35% of calories from fat, 59mg cholesterol, 1072mg sodium, 55g carbohydrate, 3g (13% of Daily Value) fiber, 31g protein, 181 IU (4%) Vitamin A, 1.4mg (2%) Vitamin C, 247mg (25%) calcium, 4mg (23%) iron. To reduce fat: Use low-fat or fat-free mayonnaise, salad dressing or cheese and reduce amount of olives or substitute with drained, sliced artichoke hearts. Yield: 4 Servings.