Ingredients
Method
- Heat the oil in a large nonstick skillet over medium-low heat. Add the onions and cook, stirring frequently, until golden, about 20 minutes. Adjust the heat if the onions begin to burn.
- Meanwhile, place the pesto and mayonnaise in a small bowl and stir to combine. Spread the pesto mayo evenly over both halves of each ciabatta roll.
- Place the ciabatta halves on a work surface. Top the bottom half of each roll evenly with the mint leaves, roast beef, caramelized onion, avocado, and arugula. Close each sandwich, secure with a toothpick and serve. Or wrap and bring to a picnic or pack in a lunchbox.
