Best Roast Beef Sandwiches With Lemon Basil Mayonnaise And Roasted Red Onions Recipes

Roast Beef Sandwiches image

Provided by Food Network Kitchen

Time 1h30m

Yield 6 main-course servings

Number Of Ingredients 13

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

Steps:

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.

Roast Beef Sandwiches with Lemon-Basil Mayonnaise and Roasted Red Onions image

Yield Makes 6 sandwiches

Number Of Ingredients 10

3 large red onions (about 2 1/2 pounds), each cut through stem into 8 wedges, peeled
7 tablespoons extra-virgin olive oil
1/4 cup balsamic vinegar
1 cup mayonnaise
1/4 cup chopped fresh basil
1 1/2 tablespoons fresh lemon juice
2 1/4 teaspoons grated lemon peel
6 4x3-inch pieces ciabatta,* halved horizontally
16 ounces thinly sliced roast beef
2 cups arugula

Steps:

Preheat oven to 425°F. Line large rimmed baking sheet with foil. Gently toss red onions, 5 tablespoons oil and vinegar in large bowl. Sprinkle with salt and pepper. Arrange onions in single layer on prepared sheet. Bake onions until brown at edges and just tender, about 40 minutes. Cool.
Mix mayonnaise, basil, lemon juice, lemon peel and 2 tablespoons oil in small bowl. (Onions and mayonnaise can be made 2 days ahead. Cover separately and chill.)
Spread mayonnaise over cut sides of bread. Place bottom halves on plates. Top with roast beef, onions and arugula. Cover with top halves of bread.
*Ciabatta is an oval-shaped flat Italian bread available at many bakeries and supermarkets nationwide.