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Roast Beef Sandwich With Caramelized Onions And Grainy Mustard, Horseradish Mayo

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Roast Beef Sandwich With Caramelized Onions And Grainy Mustard, Horseradish Mayo

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)
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