This comforting chowder is reminiscent of the type of meal Cook and his crew might have enjoyed on chilly nights at sea, providing warmth and sustenance on their long voyages.
Melt butter in a pot and sauté onion until soft.
Add potatoes and stock, simmer until potatoes are tender.
Add fish and cook until flaky.
Stir in cream, season with salt and pepper, and serve hot.