Defrost the salmon if necessary. Wash the dill, shake dry and chop finely. Mix with cream. Grate parmesan.
Preheat oven (electric cooker: 200°C/circulating air: 175°C/gas: level 3). Peel and wash potatoes and cut or slice them into thin slices. Place them in a greased gratin or casserole dish, drizzle each layer of potatoes with a little cream, season with salt and pepper and sprinkle with Parmesan cheese.
Bake in a hot oven on the lowest shelf for 50-60 minutes.
Wash lemon hot, rub dry. Peel or thinly peel half of the lemon peel with a zest ripper and cut into fine strips. Squeeze lemon. Wash the fish, dab dry and dice.
Sprinkle with 1-2 tablespoons lemon juice, salt and chill.
Dab salmon dry if necessary and spread on the casserole about 10 minutes before the end of the cooking time and bake with it.
In the meantime wash and clean the sugar snap peas. Peel and dice the shallot and sauté in hot butter. Add sugar snap peas and 5-6 tablespoons of water. Season with salt, pepper and 1 pinch of sugar. Cover and steam for about 3 minutes.
Stir in 1-2 tablespoons lemon juice and zest. Season again with sugar if necessary. Serve with the salmon casserole.