This is smoked salmon similar to the one that can can be bought sliced and vac-packed for 50-60 €/kg or more. It comes out very soft and mellow, with an excellent delicacy in texture and taste. I don't know if this is the original or the best method, but it is the one I have ended up with after years' of experiments. It should be treated as a fresh product and will keep for about one week refrigerated at 0-4 C/32-39 F or several months in the freezer.
If using salmon that is not farmed, it should be frozen below -20 C/-4 F for a few days before or after smoking in order to kill possible harmful parasites.
The quality of the salmon is extremely important for the result with this method. Use nothing else than the freshest and best product. A good test for freshness of fish is that really fresh fish smells - nothing. The larger the fillet, the better the result.
The salt is also important. Use iodine-free, all-natural salt, i.e. sea salt or mountain salt. I use Himalayan pink mountain salt or Irish sea salt, because that's what is available to me. Use the best you can find. Fine or coarse doesn't matter.
Serving suggestions:
On toast au naturel or with a drop of lemon only. It also tastes great with avocado. Or in sushi.
Instructions:
Do not rinse the fillet. Pat it dry with absorbing paper. Remove all bones with a pair of tweezers. Calculate 65 g/1 kg fillet (1 oz/1 lb) of salt + 1/2 tsp (not more!) of freshly ground white pepper per fillet. Rub the flesh side of the fillet carefully with salt and pepper and put in a non-reactive (glass, plastic, stainless steel) tray. Cover and refrigerate for 48 hours, as cold as possible (ideally -3 to +2 C/29-36 F). Turn around every twelve hours. Do not pour off the liquid that forms. Take up the salmon, rinse thoroughly and pat dry again.
Smoke the fillet immediately thereafter for 16-24 hours at 16-24 C/61-75 F. Do not at any moment let the temperature rise above 30 C/86 F, since that can separate the fat. Refrigerate the salmon again for two days before consumption for the best result. Trim off the hard outer layer before slicing thinly. Refrigerate or freeze.