6 ounces ground beef 6 ounces ground pork 6 ounces ground veal 1/4 cup plain dry bread crumbs 3 tablespoons
minced onion 2 tablespoons ketchup plus additional ketchup for serving 1 tablespoon Worcestershire sauce Yolk
of 1 egg 1/2 teaspoon salt 1/4 teaspoon pepper 4 hamburger buns, split In medium bowl, combine the
ground meats, bread crumbs, onion, ketchup, Worcestershire sauce, egg yolk, salt, and pepper; Shape into 4 patties,
each 1/2 to 3/4-inch thick. Grill outside or inside cook until done Serve on the buns toasted or not
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