Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
   2      tablespoons   nonfat mayonnaise
   2      tablespoons   creamy mustard-mayonnaise blend
   1                    egg white
  12 1/4  ounces        albacore tuna in water -- (2 cans)
                        drained and flaked
     1/2  cup           dry breadcrumbs -- divided
     1/4  cup           chopped green onions
                        vegetable cooking spray
     1/4  cup           nonfat mayonnaise
   1 1/2  ounces        hamburger buns -- (4) split
   4                    lettuce leaves
   4      slices        tomato
   4      slices        sweet onion

Preparation:

Combine first 3 ingredients in a medium bowl, and stir well. Add tuna, 1/4 cup breadcrumbs, and green onions; stir well. Divide mixture into 4 equal portions, shaping each into a 4-inch patty. Press the remaining breadcrumbs evenly onto both sides of patties. Coat a large nonstick skillet with cooking spray; place over medium-high heat until hot. Add patties; cover and cook 3 minutes. Carefully turn patties over; cook, uncovered, for 3 minutes or until patties are golden. Yield: 4 servings.