325g potato, mashed (without milk or butter)
325g salmon fillet, poached in salted water for 3-4 minutes
1tbsp tomato ketchup
½tbsp anchovy essence
½tbsp English mustard
salt and pepper
For the sauce
250-300ml strong fish stock (a cube will do)
25ml white wine
100ml double cream
Fresh sorrel leaves (about five), shredded
salt and pepper
700-800g spinach, picked over, washed and dried
To make the fishcakes, mix together the potato, half the poached salmon, the ketchup, anchovy essence, mustard and seasoning until it is smooth. Flake the remaining salmon and fold it in gently. Mould the mixture into 8 round cakes and refrigerate them.
To make the sauce, bring the fish stock to the boil in a thick-bottomed pan. In another pan melt the butter and stir in the flour. Cook very slowly over a low heat for 30 seconds, then whisk the fish stock into the flour mixture. Pour in the white wine and simmer for 30 minutes until the sauce has thickened. Add the cream and reduce the sauce until it is of a thick pouring consistency, then stir in the sorrel and season.
Lightly flour the fishcakes and fry in vegetable oil until coloured on both sides, or brush them with oil and cook for 10-15 minutes in a moderately hot oven (390°F/200 °C/gas mark 6).
Remove the stalks from the spinach leaves, wash the leaves and shake off as much water as possible. Heat a large saucepan over a medium flame, add the spinach, lightly season with salt and pepper and cover tightly with a lid. Cook for 3-4 minutes, stirring occasionally, until the leaves are tender. Drain in a colander to remove excess water.
Divide the spinach between four warmed plates, place two of the fishcakes on top and pour over the sauce. Serve immediately.