"Serve with oven fries..."
INGREDIENTS
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1 1/4 lbs ground beef
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1 cup finely chopped sweet white onion
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1/2 cup quick-cooking oats
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2 tablespoons whole milk
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1 large egg, beaten
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1 cup shredded cheddar cheese
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1 tablespoon ketchup
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1 tablespoon mayonnaise
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1 tablespoon prepared yellow mustard
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2 tablespoons sweet pickle relish
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1/4 teaspoon salt (to taste)
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1/4 teaspoon fresh ground black pepper (to taste)
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lettuce leaf
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3 slices onions, for topping