Ingredients Ingredient Checklist 1 large red onion, cut into 1/2-in.-thick slices 2 tablespoons extra-virgin olive oil 1 tablespoon balsamic vinegar ½ teaspoon kosher salt ¼ teaspoon freshly ground black pepper 3 medium heirloom tomatoes, sliced 1 (5-oz.) container baby arugula 8 ounces cooked salt-and-pepper-seasoned flank steak 1 ripe peeled avocado, sliced ½ cup thinly sliced […]
