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Export 5 ingredients for grocery delivery
Step 1
Heat a 10-inch skillet over medium-low heat.
Step 2
Stir in the oil and onions, season with salt and pepper and cook until slightly brown, turning occasionally about 15 to 17 minutes.
Step 3
Slice the bread open, place 3 oz of cooked roast beef on each piece and top with 1/4 of the caramelized onions.
Step 4
Top with cheese and place in the broiler for 1 to 2 minutes to melt the cheese, careful not to burn it.