"If the piles of tender roast beef on top of pull-apart Hawaiian rolls don’t get you, surely the combination of caramelized onions, horseradish mayonnaise and Swiss cheese will. Basically, you need this sandwich bake in your life, and you need it now. MORE + LESS -..."
INGREDIENTS
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1 tablespoon oil
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2 large yellow onions, thinly sliced (about 4 cups)