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In a large pot or Dutch oven, heat butter over medium-high heat. Add the onion, celery, and pepper. Stirring often, cook for 10 minutes, or until the vegetables begin to brown. Pour in a splash of stock and scrape up any brown bits.
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Add the remaining stock, a generous pinch or two of sea salt, and the potatoes. Bring mixture to a boil and then turn down to a bubbling simmer. Cook for 15 minutes, or until potatoes are tender.
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Add corn and cod, and cook for 10 minutes more.
Finally, stir in the apple cider vinegar and adjust seasoning to taste. Finish with scallions and parsley.
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*I halved the cobs and added them to the broth while it simmered. This can give thinner broth some added flavor, but it's not a necessary step. You can add the cobs with the stock and then remove just before you add the kernels and fish.