
Makes 4 to 6 servings
4 green bell peppers 2 red bell peppers 2 yellow bell peppers 2 1/2 cups extra-virgin olive oil, plus as needed for drizzling 3 red onions, sliced thin 2 carrots, sliced 1/4 inch thick 4 celery stalks, trimmed, sliced 1/4 inch thick 1/2 cup chopped fresh flat-leaf parsley…