Honey Mustard Chicken With Cauliflower Rice

Ingredients

• 3 tablespoons plus 1 teaspoon olive oil, divided
• 2 tablespoons Dijon mustard
• 1 tablespoon honey
• 1 large garlic clove, minced or finely grated
• 1/2 teaspoon freshly ground black pepper, divided
• 1 1/2 pounds boneless, skinless chicken thighs (4 to 6 thighs)
• 2 navel or Cara Cara oranges (or a mix)
• 1 small yellow onion (5 ounces), diced
• 3/4 teaspoon ground coriander
• 1/2 teaspoon ground cumin
• 6 cups (1 1/2 pounds) fresh riced cauliflower (do not use frozen; see Where to buy and Notes)
• 1/2 teaspoon fine salt
• 1/3 cup roasted, unsalted pistachios, coarsely chopped
• 1/4 cup chopped fresh flat-leaf parsley, plus more for serving