Quinoa Veggie Burger with Roasted Red Pepper Relish

Name: Quinoa Veggie Burger with Roasted Red Pepper Relish
Ingredients: 1⁄3 cup olive oil; 4 cloves garlic, finely chopped; 1 small carrot, finely chopped; 1 small yellow onion, finely chopped; 1 rib celery, finely chopped; 2 cups baby arugula, blanched, shocked, finely chopped, and squeezed dry; 2 cups cooked quinoa; 1⁄2 cup breadcrumbs; 2 tbsp. oregano leaves, finely chopped; 1 (15-oz.) can great northern or cannellini beans, rinsed, drained and mashed; 1 egg; Kosher salt and freshly ground black pepper, to taste