This traditional Scandinavian recipe often appears on Christmas Eve smorgasbords. You can easily halve the recipe to serve a small gathering, too. Buy one fillet and cut it in half cross-wise or select 2 equal-size pieces of center-cut fillet weighing 1 1/2 to 2 pounds total. 12. Use previously frozen salmon or freeze fish at 0 degrees for 48 hours to kill any parasites that may be present.