• 1 pound sliced roast beef
  • Salt and pepper
  • 2 large onions, caramelized
  • 4 mini Italian hero rolls
  • 2 teaspoons butter (optional)
  • 4 slices Gruyre cheese
  • 1 cup sauted mushrooms (optional)
  • 2 tablespoons Dijon mustard
  • 1 cup mayonnaise
  • 2 teaspoons red wine vinegar
  • 2 tablespoons chives, chopped


Season roast beef with salt and pepper. Heat a large, cast-iron pan and caramelize beef to get some color. Add pre-caramelized onions to the pan to heat through.


Toast the rolls with butter, if desired, and slice in half.


Place 4 ounces of meat on the bread and top with a thin layer of onions, mushrooms (optional) and Gruyre.


Place sandwiches under broiler in the oven to melt cheese.


Mix mustard, mayonnaise and vinegar with chives and spread on sandwiches.