Prepare Court Bouillon: In a large saucepan, combine water, carrots, leek, celery, lemon, bay leaves, thyme, and peppercorns. Bring to a boil, then lower the heat and simmer 30 minutes, depending on desired intensity of flavor.
Prepare Salmon: Fill a medium straight-sided skillet with simmering court bouillon. Reserve remaining court bouillon for another use. Season salmon steaks on both sides with coarse salt. Carefully lower into the skillet. Return liquid to just under a simmer. Cook until the fish is opaque throughout and firm to the touch, 5 to 8 minutes. Use a slotted fish spatula to transfer salmon steaks to plates. If desired, remove skin using the tines of a fork.