You can make Lox to your own tastes by adding one or several of these optional ingredients: 1/4-cup fresh dill, vodka, gin, cognac. You can mix up about 2oz each of mint and parsley (flat leaf) with dill. Also, a subtle but very important spice is crushed star anise, using about two stars of it per pound of fish.
For the salmon, get 1 pound slicked in two equal pieces. The best of course would be wild-caught Alaskan king salmon. You're going to sandwich the two pieces together, skin side out, so try to get a piece that is consistent in size that you can cut in half, or have the fish folks slice two equal slices.
fresh thick salmon, Alaskan King Salmon is best
Kosher flake salt (3-8 tablespoons)
brown sugar (3-8 tablespoons)
coarse fresh ground pepper