Place the smoked salmon slices or pieces of darns in a medium-sized, non-porous casserole dish. In a separate medium bowl, combine all the ingredients for the sauce and whisk them together well, and pour over the fish. Cover the dish with cling film, and marinate the fish in the refrigerator for 4 to 6 hours.
Prepare an outdoor grill with coals about 5 inches (10 cm) from the grate. Double up tin foil and stick some holes into it with a knife to let the smoke through. Place the tin foil onto the grill, and the salmon slices / darns on top, and heat them up gently. The salmon is already “cooked”, so all you need to do is heat it up to bring out all the flavours.