Step 1

Cut any thick celery stalks in half, trim all of it into thumb-size lengths, then wash and leave wet. Melt half the butter in a large frying pan, then add the celery, onion and bay leaves. Season, cover, then cook over a medium heat for about 30 mins, stirring occasionally to stop the onions catching.

Step 2

Meanwhile, prepare the breadcrumbs. Melt the remaining butter in a separate pan, then toss in the crumbs and walnuts, stirring often until lightly golden and toasted. Set aside.

Step 3

Heat grill to medium. When the celery is tender, turn the heat right up, pour in the wine and stock, then reduce by two-thirds. Pour in the cream, then reduce for a final few mins until you have a syrupy sauce. Check seasoning, tip into an ovenproof dish, then scatter with the breadcrumbs and Parmesan. Grill for 2-3 mins, until the sauce bubbles. Let it sit for 5 mins before serving.