Wash the salmon and pat dry, remove any bones with tweezers.
Roast the coriander seeds in a pan without oil and then crush them together with the peppercorns in a mortar; Mix together salt, sugar, coriander, pepper and lemongrass powder. Finely chop the dill and stir into the spice mixture.
Place the salmon fillet skin side down on a large sheet of cling film and distribute the marinade evenly on the fish meat. Wrap the cling film tightly around the salmon. Place the fish in a shallow dish, cover with a wooden board and cover with e.g., complain a can. Put in the refrigerator for 2 days, but turn 1-2 times a day.
Then cut the fish into thin slices, it is a matter of taste whether you leave the stain on or remove it beforehand. Serve with jacket potatoes or baguette.