Painted Desert Roasted Pepper Salad

Dressing
1/2 cup extra-virgin olive oil
1/4 cup vegetable oil
2 garlic cloves
1 tablespoon chopped onion
1/4 cup cider vinegar
1/2 teaspoon salt
1/2 teaspoon granulated sugar
1/8 teaspoon dried Mexican oregano
Freshly-ground black pepper, to taste

Pur