Preheat the oven to 200°C/400°F/Gas Mark 6. Check the fish carefully and remove any bones, then rinse in cold water and pat dry. Bake the cod and salmon in foil with a bit of olive oil for 12-14 minutes or until the fish is cooked through. Take the fish from the foil, flake the flesh and set aside.
2 pieces cod, 2 pieces salmon
Boil the potatoes for about 20 minutes, until tender. Drain, allow to steam briefly in the warm pan then mash with 1/2 of the butter. and put to one side.
2 large potatoes, 40 g unsalted butter
Melt the remaining butter in a saucepan and add the onion and garlic. Cook until soft, for 4-5 minutes, then transfer to a mixing bowl and add the mashed potato, flaked fish, egg yolk, parsley and lemon juice. Mix together well.
40 g unsalted butter, 1 small onion, 1 clove garlic, 1 large egg yolk, 1 tbsp parsley, 2 tsp lemon juice
Divide the mixture into 8-10 pieces and shape each one into a fishcake.
Put the flour seasoned with 1/4 teaspoon of freshly ground black pepper into one shallow dish, the beaten egg into another and the breadcrumb mixture into a third. Coat each fishcake first in the flour, then the egg, then the breadcrumbs.
1 large eggs, 50 g flour, 1/4 tsp ground black pepper, 100 g breadcrumbs
Melt the oil with the butter in a pan over medium heat. Cook the fishcakes until golden brown on both sides and warmed right through to the middle: about 8-10 minutes.