Preheat grill. Cut cheese slices into half-inch pieces. In a medium-size bowl, combine cheese, ground beef, and hot pepper sauce, and mix well. Shape meat into four equal patties. Slightly depress center of each patty. Grill burgers approximately 5 minutes on each side until meat is cooked through. Place burger on bottom of hamburger bun, top with 1 slice tomato and a quarter of the chopped cilantro. Add top bun and serve.
Exchanges per serving: 1 starch, 4 medium-fat meat. Carbohydrate choices: 1.