Sufficient quantity julienned green apples and celery tossed with lemon juice
In a large bowl, combine all the ingredients for the burgers. Shape into 4 patties.
In a medium bowl, whisk the egg with the milk. To bread the patties, dredge them in the flour, dip them in the beaten egg and coat them with bread crumbs. Press well with your hands to make sure the crumbs stick. Refrigerate.
In a skillet, heat the butter and brown the burgers over medium heat for about 4 minutes on each side. Two minutes before the burgers are done, top each with a slice of cheese.
Warm or toast the buns and spread them with mayonnaise. Place a burger on each bun and top with the apple-celery mixture.