1Place salmon heads, chopped carrot, chopped red onion, chopped celery, garlic cloves, bay leaves, whole black peppercorns, and salt into a large pot and add water.
2Bring to a gentle boil, then lower to a simmer and cook for about 45 minutes.
3Set aside the broth for later use.
4Slice the leek.
5Sauté the sliced leeks in butter in a separate pot.
6Dice the potatoes.
7Add the diced potatoes to the pot with the leeks.