INGREDIENTS
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2 tablespoons vegetable oil, plus more for brushing
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2 large onions, finely chopped
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Kosher salt
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1/4 cup mayonnaise
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2 tablespoons ketchup
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1 tablespoon sweet pickle relish
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1/2 teaspoon white vinegar
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2 pounds ground beef chuck (preferably 60 percent lean)
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4 hamburger buns, split
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1/4 cup sliced dill pickles
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3/4 cup shredded iceberg lettuce
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4 to 8 thin slices tomato
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Freshly ground pepper
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1/4 cup yellow mustard
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8 slices American cheese
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