Peel and wash the potatoes. Cut in each case vertically close together, but do not cut through. Grease a large flat casserole dish or the fat pan of the oven. Place the potatoes in the dish.
Melt 2 tablespoons of butter and drizzle over it. Sprinkle potatoes with salt. Bake in the preheated oven (electric cooker: 200 °C/ convection oven: 175 °C/ gas: level 3) for 30-35 minutes. Wash the salmon and pat dry.
Sprinkle with lime juice and let it steep a little. Crumble the toast finely. Wash the dill and chop finely, except for a little to garnish. Mix honey, mustard, dill and bread. Season salmon with salt and pepper, spread honey-mustard mixture on top.
Add salmon to the potatoes and bake everything else for about 15 minutes. Serve, garnish with lime and the rest of the dill. Serve with a green salad.