INGREDIENTS
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2 Tbsp vegetable oil and more for brushing griddle
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2 large onions, finely chopped
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salt
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1/4 C mayo
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2 Tbsp ketchup
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1 Tbsp sweet pickle relish
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1/2 tsp white vinegar
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1 1/2 tsp mustard
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2 lbs. ground chuck (60%)
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4 hamburger buns
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pickles ( I left off)
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1 C shredded iceberg lettuce
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4-8 slices of tomato
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pepper
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8 slices of American cheese (I used cheddar)