First cook the diced onion with a large piece of salt pork, bacon fat or oil. The salt pork or bacon will add tons of flavor to your chowder, but you can use your favorite oil instead.
To thicken the chowder, add the butter and flour and let it cook into the onion mixture. Next add the diced celery and potatoes, thyme sprigs and a bay leaf. Add in the fish stock and let the mixture cook until the potatoes are soft when pierced with a fork.
While you are waiting for the vegetables to cook, prepare and slice the salmon. Remove skin from the salmon. Start with the tail end and hold the skin down, while you guide a sharp knife between the skin and fish, keeping the blade tilted slightly down toward the skin. The motion is not a sawing motion, but moving the blade from top to bottom and then again from top to bottom until the skin is removed. Cut each filet in half down the center line and then into 2-inch chunks. Set aside.
When the vegetables have cooked, add in the milk. I recommend using whole milk to add richness. Stir and let thicken. The starch in the cooked potatoes will thicken the broth. You can smash a few potato pieces to thicken more if desired.
The last step is to add the salmon chunks. When ready to serve, remove the salt pork, thyme stems and bay leaf, heat the chowder over low heat. Place the chunks of salmon carefully into the chowder and cook for 5 minutes. Remove from the heat and the fish will continue to cook from the heat of the chowder.
To serve, carefully spoon the salmon and potatoes into shallow soup bowls, adding in the broth. Sprinkle with thyme leaves, chopped parsley or snipped chives to garnish.
ENJOY THIS RECIPE FROM FreshFoodinaFlash.com