Peel, wash and roughly grate the potatoes. Peel onion and grate finely with the potatoes. Add egg and flour. Season to taste with salt and pepper. Heat the clarified butter in portions in a pan.
Bake 8 buffers one after the other, but put 3 tbsp. of potato mixture per buffer in the pan (a total of 3-4 buffers per pan) and fry on both sides for 3-4 minutes. Keep the potato pancakes warm.
Fry the rest of the potato mixture as well. Mix 4 tsp. cream and lemon juice and season with salt and pepper. Cover 4 buffers with 1 tsp. lemon cream and 1 slice of salmon and garnish with lemon wedges and dill.
Cover the remaining buffers with 1 tsp cream, 1/2 trout filet and 1 tsp cranberries.