PREPARATION
Melt Spread in a large nonstick skillet over medium-high heat and cook onions, stirring occasionally, until golden, about 8 minutes. Add vinegar and cook 1 minute. Stir in water and next 2 ingredients. Bring to a boil. Cook, stirring occasionally, until sauce is slightly thickened, about 5 minutes. Top hamburgers with onions and serve on Kaiser rolls.