Heat oven to 375°F. Lightly spray large cookie sheet with CRISCO® Original No-Stick Cooking Spray, or grease with shortening. In small bowl, gently mix ham, cheese and apple. Separate dough into 10 biscuits. Press or roll 5 biscuits into 4-inch circles on cookie sheet.
Place about 1/2 cup ham mixture onto center of each circle. Press or roll remaining 5 biscuits into 5-inch circles; place over ham mixture on each. Press edges with fork to seal. Mix egg and water; brush over filled biscuits.
Bake 13 to 18 minutes or until golden brown. Cut each sandwich in half. To serve, garnish with tomato. Serve warm.