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Tip all the ingredients for the salt mix into a food processor and whizz until everything is combined and the spices are completely ground.
Stroke your hand along the salmon fillet to check for any stray bones. If you find any, pull them out with a pair of tweezers or small pliers.
To skin the salmon fillet, lay the fish skin-side down with the tail end closest to you. Insert your knife at an angle at the tail end and cut through the flesh to the skin. Turn the blade so it’s almost flat against the skin, then take hold of the skin with the other hand. Pull and wiggle the skin towards you so as to cut the fillet away. Halfway through removing the skin, hold the knife firmly and flip the fillet over. Gently lift the fillet away from the skin and discard the skin. Trim away the thinner part, plus any fat around the edges, so that the fillet has an even shape.
Scatter about a third of the salt mix onto a large tray in a line about the size of the salmon fillet. Lay the salmon, skinned-side down, over the salt and pack the rest of the salt on top. Cover with cling film, put another tray on top and weigh it down with a few cans or an empty casserole dish. Leave in the fridge overnight or for at least 10 hrs.
Under cold running water, wash the salt mix off the salmon fillet, then dry with kitchen paper. Finely chop the dill. Lay the salmon on a board and cover with the dill, pressing it down to pack it onto the salmon.
If serving as a plated starter, use a sharp carving knife to cut the salmon straight down into fine slices, allowing 6 slices for each plate.
To make the horseradish cream, whisk together the cream and crème fraîche. Add the horseradish, lemon juice and seasoning, then continue to whisk until thick. Dress the salad leaves in a little olive oil. You are now ready to plate up.
Arrange a neat pile of baby salad leaves in the centre of each plate. Curl slices of the salmon into bow shapes around the leaves. Continue all the way around the plate in a petal fashion. Use 2 teaspoons to make small quenelles of horseradish cream and spoon each into each bowl.