Roast Beef Sandwiches

Total Time:
1 hr 30 min
Prep:
1 hr 30 min

Yield:
6 main-course servings

Ingredients
  • 1 medium red onion, halved and thinly sliced
  • 1 tablespoon, plus 2 teaspoons kosher salt, plus more to taste
  • 6 tablespoons red wine vinegar
  • 3/4 cup mayonnaise
  • 3/4 cup sour cream
  • 1/4 cup plus 2 tablespoons jarred grated horseradish (with liquid)
  • 1/2 teaspoon grated lemon zest
  • Freshly ground black pepper
  • Hot sauce
  • 6 Kaiser rolls
  • 12 slices vine-ripened tomatoes
  • 24 ounces freshly sliced rare roast beef
  • 3 loosely packed cups watercress or arugula, or a combination of both
  • Copyright 2001 Television Food Network, G.P. All rights reserved
Directions

In a small bowl, mix together the onion and 1 tablespoon of the salt. Set aside for 20 minutes. Rinse the onions with cold running water. Drain and squeeze to remove excess liquid. Combine the onions and the vinegar and marinate at least 30 minutes or up to 24 hours.

In a small bowl, mix together the mayonnaise, sour cream, horseradish, zest, and 2 teaspoons salt. Season generously with pepper and hot sauce to taste. Refrigerate the horseradish sauce for at least 30 minutes.

Preheat the broiler. Slice the rolls in half lengthwise. Using your hands, shallowly scoop out the inside of each half. Transfer the rolls to a baking sheet and arrange scooped-side up. Toast the rolls under the broiler for about 1 minute. Slather the inside of the rolls with the horseradish sauce. On each of the roll bottoms, layer 2 tomato slices and season with salt and pepper to taste. Top the tomatoes with some of the roast beef overlapped into "ruffles" and season with salt and pepper. Top the meat with some of the onions and watercress and cover with the tops of the roll. Serve immediately.


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