Nutritional Information Per Serving Calories: 327 Fat: 10.3g Protein: 31.4g Carbohydrates: 25.1g Dietary Fiber: 10.3g Cholesterol: 75mg Iron: 3.8mg Sodium: 391mg Calcium: 116mg Serves 4 adults Time To Cook Under 25 minutes. Blue Cheese Stuffed Certified Angus Beef Sirloin Burgers On English Muffins           Ingredients Cooking spray of your choice 1/2 cup finely chopped onion 1 pound ground sirloin 3 tablespoons unseasoned dry breadcrumbs 2 tablespoons water 1 egg white, lightly beaten 1/4 cup, crumbled blue cheese, 1 ounce 1/4 cup fat-free sour cream 4 (1-ounce) premium English muffins, toasted 4 leaf lettuce leaves 4 (1/4-inch-thick) beefsteak tomato slices  Directions     Coat a small nonstick skillet with cooking spray; place over medium heat until hot. Add onion; saute 5 minutes or until tender. Remove from heat; let cool. Combine onion, beef, breadcrumbs, water, and egg white in a large bowl; stir well. Divide mixture into 8 equal portions, shaping into 1/2-inch-thick patties. Spoon 1 tablespoon blue cheese into the center of 4 patties; top with remaining patties. Press edges together to seal. Prepare grill. Place patties on grill rack coated with cooking spray; grill 4 minutes on each side or until done. Spread 1 tablespoon sour cream over top half of each muffin, and set aside. Line bottom halves of muffins with lettuce leaves; top each with a tomato slice, a patty, and top half of muffin.   © 2003 Roberts Food Center. Designed and Hosted by The Computer Company, Inc.