INGREDIENTS
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1 large red onion, thinly sliced
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1 Tbsp. extra virgin olive oil
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1/4 cup NAKANO Natural Rice Vinegar
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1 1/3 lbs. ground beef
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4 large garlic cloves, finely minced
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4 slices Cheddar, Swiss, or jack cheese (optional)
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4 hamburger buns, toasted
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Salt, pepper