Roast Beef Sandwich with Caramelized Onions and Grainy Mustard, Horseradish Mayo Recipe
"A recipe for Roast Beef Sandwich with Caramelized Onions and Grainy Mustard, Horseradish Mayo : The best part of the roast beef dinner might just be in using the leftovers to make roast beef sandwiches! Tender roast beef with sweet caramelized onions and the bite of a touch of horseradish...."
INGREDIENTS
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1 tablespoon olive oil
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4 cups onion, sliced
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1/2 cup water
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4 buns, cut in half and lightly toasted
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4 slices cheese, cheddar, swiss or provolone
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1 pound roast beef, warm and thinly sliced
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1/4 cup gravy
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2 tablespoons mayonnaise
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1 tablespoon horseradish
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1 tablespoon grainy mustard
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1 handful arugula (optional)
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