FRENCH ROAST CHICKEN WITH AUTUMN VEGETABLES AND MADEIRA GRAVY INGREDIENTS 2kg chicken 1 bunch tarragon leaves 125g unsalted butter 2 tsp celery salt ¼ cup extra virgin olive oil 6 pearl onions, peeled 8 small beetroot, peeled 12 small carrots, peeled 1 head baby fennel, sliced 4 sprigs rosemary leaves sea salt flakes and freshly-ground…