Dill and salmon are a classic pair. Use the freshest fish you can find--wild Pacific Northwest salmon is in season now--for this hors d'oeuvre based on the Swedish dish gravlax. The salt draws moisture from the fish as a way to preserve it; much of the sodium drains off with the liquid. It takes three days to cure, but the results are well worth the effort. Here, the cured fish is served with cucumber salad, but you can also serve it with crackers or baguette slices.