Chopped Beet Salad

Name: Chopped Beet Salad
Ingredients: 2 tablespoons extra-virgin olive oil; 1½ teaspoons grated orange zest; 2 tablespoons orange juice (from 1 large orange ); 1½ tablespoons champagne vinegar; 1 teaspoon Dijon mustard; 1 teaspoon honey; ¼ teaspoon plus ⅛ teaspoon salt; ¼ teaspoon ground pepper; 3 cups c hopped refrigerated cooked beets ( 3 8.8-ounce packages ); ½ cup crumbled feta cheese ( 2 ounces ); 1½ tablespoons chopped salted roasted pistachios; Chopped fresh mint for garnish (optional)