Ingredients
- 1 1/2 pounds red-skinned potatoes, pierced with a fork
- 4 tablespoons unsalted butter
- 3/4 to 1 cup milk
- Kosher salt and freshly ground pepper
- 1/2 medium onion, sliced
- 3 tablespoons all-purpose flour
- 2 1/2 cups low-sodium chicken broth
- 2 teaspoons Worcestershire sauce
- 4 thick slices sourdough bread
- 3 tablespoons dijon mustard
- 1 tablespoon prepared horseradish
- 3/4 pound sliced roast beef
- 1/2 bunch watercress, woody stems removed
- 1/4 cup chopped fresh parsley
Directions
Microwave the potatoes on high until soft, about 20 minutes. Using a fork, mash the potatoes in a bowl with 2 tablespoons butter. Add the milk and mash; season with salt and pepper. Preheat the broiler.
Meanwhile, melt the remaining 2 tablespoons butter in a skillet over high heat. Add the onion and cook until soft, about 4 minutes. Stir in the flour and cook until slightly brown. Gradually whisk in the chicken broth until smooth. Whisk in the Worcestershire sauce and simmer until thick, about 3 minutes.
Toast the bread under the broiler, about 1 minute. Spread the mustard and horseradish on toasts; place each on a plate. Pour some gravy over the toast; top with the roast beef, more gravy, watercress and parsley. Season with salt and pepper. Serve the sandwiches with the potatoes.
Photograph by Antonis Achiellos

Photo: Hot Open-Face Roast Beef Sandwiches Recipe
















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By abutler0918
on November 12, 2012
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My very picky brother-in-law had seconds (sans the watercress. Only reason I didn't give this one five stars is because we all agreed the roast beef should be heated up or cooked in with the gravy. Other than that, quite delicious.
By btirey
Bedford, IN
on April 23, 2011
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been here tried this. it was a decent thing but it was so uninteresting I was nearly put to sleep. gave away all my extras rather than have it for lunch.
By desert5150_11876944
victorville, CA
on May 31, 2010
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This was delicious and easy to make. I have 4 boys, so I stretched it a little more and eyed the measurements I did add a little beef base to the gravy for color but it was yummy without. I also used sliced roast beef from the deli and added it in in the last 2 minutes before serving to heat it through. From my 4 year old to my husband, it was a hit they've already asked me to make it again!
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