Roast Beef Sandwich with Caramelized Onions and Grainy Mustard, Horseradish Mayo

Servings: makes 4 servings

Prep Time: 10 minutes
Cook Time: 50 minutes
Total Time: 1 hour

Ingredients
  • 1 tablespoon olive oil
  • 4 cups onion, sliced
  • 1/2 cup water
  • 4 buns, cut in half and lightly toasted
  • 4 slices cheese, cheddar, swiss or provolone
  • 1 pound roast beef, warm and thinly sliced
  • 1/4 cup gravy
  • 2 tablespoons mayonnaise
  • 1 tablespoon horseradish
  • 1 tablespoon grainy mustard
  • 1 handful arugula (optional)
Directions
  1. Heat the oil in a pan over medium heat.
  2. Add the onions and water and cook, covered, until completely tender and caramelized and golden, about 40-50 minutes, adding more water as needed.
  3. Mis the mayo, horseradish and mustard.
  4. Assemble sandwiches and enjoy!

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