Wash the salmon, dab dry and cut into 8 thin pieces. Wash and dry the limes and grate the peel. Wash the dill. Put some stems aside for garnishing, chop the remaining dill finely.
Season salmon with sea salt, pepper, lime zest and dill. Cover and chill for 1 hour.
Peel and wash the potatoes and slice them into thin slices. Grease 4 small fireproof moulds or one large mould. Layer the potatoes like roof tiles. Mix cream and horseradish, salt and spread on the potatoes.
Bake in the preheated oven at 200 degrees (fan oven 175 degrees, gas mark 3) for about 45 minutes.
Squeeze the limes. Heat 2 tablespoons of butter in a frying pan. Fry the salmon on each side over medium heat for about 3 minutes. Add lime juice and season to taste. Serve everything. Garnish with lime and remaining dill.
Tip: Serve the dish with cucumber salad, for example. A well-chilled white wine goes well with it.