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1
Prepare the salmon fillets by using tweezers to remove the pin bones. These small, thin, spiky bones can be felt by running your fingers along the top of the fish. Pinch the end of a pin bone with the tweezers, push down gently on the flesh with your other hand, and pull the pin bone straight out. You may find as many as 20 pin bones in each fish fillet, but don't be daunted by the task, it only takes a few minutes.
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2
Place the salmon fillets skin side down in a non-reactive container (ceramic or a baking sheet lined in plastic wrap) with high sides to keep any juices released during curing from spilling from the container.
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3
Apply the cure. Stir together the salt and sugar, then rub the mixture evenly over each salmon fillet. Sprinkle the chopped dill over the salmon, and pour 1 tablespoon aquavit over each fillet.
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4
Place one of the salmon fillets skin side up on top of the other fillet. The salmon fillets will be touching flesh to flesh, each with the skin on the outside. Cover the stacked salmon fillets with plastic wrap and place a heavy weight atop the fish. A plate or baking tray weighed down with bags of flour works well. Put the salmon in the refrigerator to cure for 2 to 3 days, turning the fish every twelve hours. The gravlax is finished curing when it feels firm to the touch at the thickest part of the fillet.
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5
Once the salmon has cured, gently wipe the cure off the top of the fillets. Use a long, narrow, flexible, sharp knife to remove the skin from each fillet. With the salmon skin side down, grab the tail end, pinching it with your thumb and fingers. If the skin is slippery, use a paper towel to grip it. Use the knife to slice between the skin and flesh. Keep the knife at an angle, pointed down towards the skin, and use a rocking motion to slice under the length of the fillet and remove the skin. Take your time and be patient, as removing skin from a fish fillet is delicate work, a skill that gets better with practice. Once the skin is removed, flip the fillet over and trim off any pieces of skin still left on the fish. After the skin is removed from both fillets, store them in the fridge, well wrapped, where they will keep for at least a week.
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6
To serve, slice the salmon as thinly as possible by using a sharp knife to shave off pieces, cutting towards the tail end. Wrap any unused salmon and return it to the fridge. Traditionally, gravlax is served with mustard-dill sauce and rye bread. It's also delicious tossed in with boiled potatoes and dressed with a lemon vinaigrette, or atop a bagel with cream cheese and chives.
