In large bowl, mix together 1/3 cup French onion soup with ground beef, bread crumbs, egg, salt and pepper. Shape into 6-8 patties. In large skillet, over medium-high heat, brown both sides of patties. Pour off excess fat. In small bowl, combine remaining soup, ketchup, water and mustard/mustard powder. Pour over meat in skillet. Cover and cook for 20 minutes, stirring sauce occasionally. Drizzle with Harvest White Truffle oil, if desired.
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