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INGREDIENTS
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1/2 pound fresh beef chuck with plenty of fat, cut into 1-inch cubes
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2 teaspoons vegetable oil, divided
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1 large onion, finely chopped (about 1 1/2 cups)
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Kosher salt
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2 tablespoons plus 2 teaspoons mayonnaise
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1 tablespoon ketchup
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2 teaspoons sweet pickle relish
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1/2 teaspoon sugar
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1/2 teaspoon distilled white vinegar
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2 soft Hamburger buns, preferably Arnold brand
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Freshly ground black pepper
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8 dill pickles chips
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2 quarter-inch-thick slices ripe tomato
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2 leaves fresh iceberg lettuce, white core section removed, torn to bun-sized pieces
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1/4 cup yellow mustard
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4 slices deli-cut American Cheese