"Slow-cooked onions add moisture and flavor to these lean beef burgers. A quick blend of mayonnaise, ketchup, relish, and vinegar makes a perfect tangy, sweet, and creamy "special sauce" for this burger. We love the dill relish here, but use sweet relish if you prefer it. Serve with sweet potato fries...."
INGREDIENTS
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1 onion
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1 canola oil
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2 ketchup
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2 low-fat mayonnaise
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2 dill pickle relish
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1 distilled white vinegar
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1 lean (90-percent or leaner) ground beef
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2 Worcestershire sauce or steak sauce
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1/2 freshly ground pepper
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4 sesame-seed or other hamburger buns
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4 tomato
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4 leaves green-leaf lettuce