"It's oozing with cheese! ????..."
INGREDIENTS
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1/4 c. salted butter
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3 lb. yellow onions, peeled and thinly sliced
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2 tbsp. balsamic vinegar
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1 lb. ground beef (80/20)
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1 lb. ground sirloin (90/10)
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1 tbsp. Worcestershire sauce
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1 tsp. kosher salt
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1 tsp. ground black pepper
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9 slices American Cheese, cut into quarters
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1 tbsp. vegetable oil
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6 potato buns
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Dill pickle slices, to serve