2 red apples, such as Braeburn or gala, halved, core removed and sliced
300²µ/10½´Ç³ú cavolo nero, leaves torn in half
300²µ/10½´Ç³ú celeriac , halved, peeled and sliced
1 garlic clove, crushed
large bunch fresh thyme
2 tbsp capers
salt and freshly ground black pepper
2 tbsp cider vinegar
2 tbsp walnuts, plus extra for sprinkling
2 tbsp walnut oil
3 tbsp butter
1.5kg/3lb 5oz –2kg/4lb 8oz whole plaice