Marinate the salmon schnitzel in lemon juice, soy sauce and sherry for 1/2 hour.
In the meantime, cook the potatoes in their skins, then peel and press them. Melt the butter in it, then fold in the egg yolk and oil and stir everything well. Add 2 tablespoons of the marinade and mix in.
Wash and dry the salmon schnitzel and place in a baking dish. Brush with the potato mixture. Lightly press in the peppercorns.
Bake everything for about 30 minutes in a preheated oven at 175 ° C.