3 tablespoons butter 2 small sweet onions, diced 2 stalks celery, ends trimmed, diced 2 cloves garlic, minced 2 sprigs of thyme, leaves removed, stems discarded 1 1/2 teaspoons ground coriander 1 head cauliflower, cut into florets, main stem and core removed * 1 apple, peeled, cored and diced (a tart or a sweet - tart apple, like a
Honeycrisp, is best) 4 - 6 cups chicken or vegetable stock (
see note in directions) 2 teaspoons apple cider vinegar salt and pepper to taste (lots of pepper!)