Sliced Beef with Lemony Arugula and Mushroom Salad

Name: Sliced Beef with Lemony Arugula and Mushroom Salad
Ingredients: 1/4 cup plus 2 tablespoons olive oil; 1 tablespoon chopped garlic; 2 teaspoons chopped rosemary; Four 3/4-inch slices of beef tenderloin, pounded 1/2 inch thick; 2 teaspoons mayonnaise; 2 teaspoons fresh lemon juice; 1 teaspoon finely grated lemon zest; Kosher salt and freshly ground pepper; 5 ounces arugula leaves (2 cups); 1 cup very thinly sliced mushrooms; 1/4 pound Parmesan cheese, shaved with a vegetable peeler