40g/1戮oz piece fresh root ginger, peeled and finely chopped
300g/10陆oz fresh gooseberries, topped and tailed
1 lemon, juice only
陆 shallot, finely chopped
4 sprigs fresh tarragon, leaves only
2 fresh thyme sprigs, leaves only
sea salt and freshly ground black pepper
125驳/4陆辞锄 caster sugar
50g/2oz sultanas
100ml/3陆fl oz cider vinegar
110ml/4fl oz double cream
2 free-range egg yolks, lightly beaten
600g/1lb 5oz ready-made all-butter puff pastry
4 whole mackerel, heads and guts removed, de-boned (you can ask your fishmonger to do this for you)
250g/9oz salmon fillet, skin and pin bones removed, flesh roughly chopped