Wash the potatoes thoroughly and cook covered for about 20 minutes. Peel onion, dice finely and sprinkle into a greased casserole dish. Wash salmon, dab dry and season with salt and pepper.
Place in the mould, pour on the wine. Close the mould with aluminium foil. Bake in the preheated oven (electric cooker: 200 °C/circulating air: 175 °C/gas: see manufacturer) for approx. 10 minutes.
Lift the salmon out of the stock, pluck it and let it cool down. Put the brew together with the onions into a pot and boil down to about 2 tbsp. Drain the potatoes, quench, peel and let them cool down.
Wash the dill, shake dry and cut finely. Mash potatoes finely with a fork. Mix both with salmon and fish stock. Season to taste with salt and pepper. Form about 12 cakes from the mixture.
Whisk the eggs in a deep dish. Turn the cakes one after the other in flour, egg and breadcrumbs. Heat the oil in a frying pan in portions and fry the cakes on each side for about 3 minutes until crispy.
Drain well on kitchen paper. Serve with mayonnaise and tomato salad.