Crispy Black Rice and Chinese Sausage Dressing

Name: Crispy Black Rice and Chinese Sausage Dressing
Ingredients: 2 red Fresno chiles, finely chopped; ¼ cup unseasoned rice vinegar; 2 Tbsp. white miso; 1 Tbsp. pure maple syrup; 7 Tbsp. neutral oil (such as grapeseed, canola, or vegetable), divided; 4 cups cooked black rice, chilled until cold (from 1½ cups raw); ½ tsp. kosher salt, plus more; 6 oz. Chinese sausages (lap cheong; about 6), thinly sliced on a diagonal; 3 celery stalks, sliced on a diagonal into ¼ pieces, plus leaves for garnish; 6 oz. shiitake mushrooms, stems removed, sliced ⅛ thick; ½ cup roasted salted peanuts, chopped