Prepare the topping for the nuts are roughly chopped and the Bread is slightly dry in the toaster and crumble. Remove the zest from the lemon and squeeze out the juice. Finely chop the dill. Mix all the ingredients with the soft butter.
Fish season with salt and pepper and brush with mustard. Put on baking sheet. On top of the fish to spread the grit. Crushing it well with your hands.
Put in a preheated oven to 160C°. Bake for 15 minutes.