Ensure the salmon fillet is boneless and skin-on. Rinse and pat it dry with paper towels.
In a small bowl, combine the granulated sugar, coarse sea salt, freshly ground black pepper, and dill seeds.
Place the salmon fillet on a large piece of plastic wrap or parchment paper.
Rub the cure mixture evenly over the salmon fillet, making sure to cover all surfaces.
Sprinkle the chopped fresh dill over the cured salmon.
If using, add the lemon zest and drizzle the vodka or aquavit over the top.
Wrap the salmon tightly in plastic wrap or parchment paper.
Place the wrapped salmon in a shallow dish to catch any liquid that might escape.
Refrigerate for 2-3 days, turning the salmon every 12 hours to ensure even curing. The salmon is ready when it is firm to the touch and has taken on a translucent, pink color.
Unwrap the salmon and rinse off the cure mixture under cold water.
Pat dry with paper towels.
Slice the salmon thinly on a bias.
Enjoy your meal!