Melt margarine in 12-in. skillet over medium heat and cook onions, stirring occasionally, until golden brown, about 25 minutes.
Combine Lipton® Recipe Secrets® Onion Soup Mix, ground beef and water; shape into 8 oval patties.
Grill or broil burgers, turning once, 12 minutes or until done.
Top each burger with caramelized onions and cheese and serve on bread.