Roast Beef Sandwiches With Lemon-Basil Mayonnaise & Roasted - cooking recipe

Ingredients

3 red onions, cut into 8 wedges
7 tablespoons extra virgin olive oil
1/4 cup balsamic vinegar
1 cup mayonnaise
1/4 cup chopped fresh basil
1 1/2 tablespoons lemon juice
grated lemon peel
6 pieces ciabatta, cut horizontally
16 ounces thinly sliced roast beef (i just got mine from deli)
2 cups arugula

Preparation

-Preheat oven to 425. Line a baking sheet with foil. Toss red onions with 5tbsp. of oil and all of vinegar in large bowl. Sprinkle the onions with salt and pepper. Place onions in single layer on lined baking sheet. Bake until onions start to brown and they are tender, about 40min. Then cool completely.
-Mix mayonnaise, lemon juice, lemon peel, basil and the remaining 2tbsp. oil in small bowl.
-Spread mayonnaise mixture over cut sides of bread. Top bread with roast beef,onions and arugula. Cover with top halves and bread and serve.