Preheat oven to 375 F. Place potatoes on a baking sheet. Drizzle with extra virgin olive oil, salt, and pepper. Bake for 20 mins. Flip potatoes and move them around in the oil. Lower heat to 350.
Bake for 40 more minutes or until brown and crispy.
While potatoes are roasting, make the pesto. Add all the pesto ingredients except the extra virgin olive oil to a blender/food processor. Pulse for 5 seconds.
With the food processor on low, drizzle in extra virgin olive oil slowly until fully incorporated. Salt and pepper, to taste.
Remove potatoes from oven and let cool till they're just warm.
In a bowl combine, potatoes, tomatoes, red onion, roasted red peppers, and 1/2 cup of pesto. Toss well and serve immediately.