Ingredients:
1 large onion, peeled, halved, and thinly sliced
Salt and pepper to taste
1 lb ground beef
1 tablespoon butter
1 tablespoon vegetable oil
4-8 slices American cheese
Mayo, mustard, and pickles for garnishing
4 toasted hamburger buns
Instructions:
In a bowl, mix the onion slices with 1 teaspoon of salt. Allow it to sit for about 30 minutes, tossing occasionally.
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