• Gather all ingredients before starting recipe
  
• Peel and slice onion
• Heat oil in a medium skillet over medium high heat and add sliced onion, sauté until the onion starts to caramelize, about 4-5 minutes
  
• Slice tomato and place a few slices on each hoagie bun, add pickled pepper slices if using.
• Move onions to one side of skillet and add two rows of 4 slices of roast beef each in the space remaining, sauté for 1-2 minutes.
  
• Fold cheese slices in half and top each section of roast beef, sauté another minute or until the cheese melts.
  

Make Sandwich

• Place sauteéd onions on bottom, top with beef and cheese, sliced peppers, and add ketchup if you like.