INGREDIENTS
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4 tbsp. vegetable oil, divided
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1 c. Onions, finely chopped
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kosher salt
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1/4 c. mayonnaise
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1 tbsp. ketchup
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1 tbsp. sweet pickle relish
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1 tsp. white vinegar
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1/2 tsp. sugar
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4 thin ground beef patties, about 1/2-in thick
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2 tsp. yellow mustard
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4 slices American cheese
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2 white hamburger buns
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Lettuce, for serving
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4 pickle chips
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cooked frozen french fries, for serving (optional)