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.
Provided by @MakeItYours
Number Of Ingredients 11
Steps:
- Heat the oil in a pan over medium heat.
- Add the onions and water and cook, covered, until completely tender and caramelized and golden, about 40-50 minutes, adding more water as needed.
- Mix the mayo, horseradish and mustard.
- Assemble sandwiches and enjoy!
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