Classic Tofu Burger

Name: Classic Tofu Burger
Prep time: 15 min
Total time: 15 min
Cuisine: American, Asian
Ingredients: 1 pack (14 oz.) of extra-firm tofu, drained and cut into 6 slices; ½ cup of soy sauce; 1 tbsp. of sugar/honey; 1 tbsp. of rice or wine vinegar; 1 clove of garlic, minced; ½ tsp. ground black pepper; 6 slices of low-fat American cheese; 6 mini whole-wheat buns, toasted; 4 oz. of alfalfa sprouts; 5-6 small radishes, thinly sliced; Cooking spray to coat the skillet; Nonfat honey or Dijon mustard (optional)