Stir mayonnaise with pesto. On each bun, layer ingredients in the following order (bottom to top): 3 tbsp pesto mayonnaise, 1/3 cup arugula, 1/4 cup roasted red peppers, 4 oz beef, 2 tbsp shaved red onions and 1 oz goat cheese.
Serve immediately or wrap each sandwich individually with plastic wrap and refrigerate for up to 1 day.
To Order, 1 portion: Serve fresh, chilled and wrapped, or place in panini press for about 3 minutes or until heated through and lightly toasted.