Black cod, also known as sablefish or butterfish, has a naturally oily meat that flakes apart with buttery smoothness and flavor. I prefer black cod over over Chilean sea bass, especially due to the overfishing that sea bass has seen over the recent decade (grocery stores like Wholefoods offers sustainably harvested sea bass). Black cod is mainly fished out of Alaska and Canada, both of which have generally good sustainability practices for their fisheries.
One of my favorite dishes in the world is black cod kasuzuke. Traditional recipes marinate fillets of black cod for up to seven days in sake, mirin (Japanese cooking wine), brown sugar and miso. Like yourself though, the idea of marinating a meat for seven days, while appetizing, is a little too long for my taste (literally). In my experiments, I’ve found that you can achieve a restaurant quality flavor in three days and if you’re really impatient, perhaps even two days. To those of you who think you can get away with marinating for a few hours in the fridge – don’t even think about it (you’ve been warned).
Ingredient List for: Black Cod Kasuzuke
- 4, 3 oz black cod fillets
- 1 cup sake (I use sweet sake, you can use dry)
- 1 cup mirin
- 1/2 cup brown sugar
- 3T miso paste (I prefer white shiro)
- DO NOT ADD SOY SAUCE
On high heat, combine sake and mirin in a pot and bring to boil. Don’t leave the pot because it will boil quite fast. Once boiling, immediately turn heat down to simmer and let stand for 2-5 minutes. Depending on how strong of alcohol flavor you like to your fish, you can let it simmer for longer to take out more alcohol flavor or take it off earlier for a stronger taste. I like to take it off around 3 minutes.
Reduce to low heat. Add brown sugar, stirring until well mixed. If you don’t have brown sugar, then you can use white sugar, but only use 1/4 cup instead, otherwise you’ll be eating candied fish.
Add miso paste and mix in well. You may find chopsticks helpful to help poke apart the clumps of miso. I use white shiro, but that’s also because I have access to dozens of varieties since I’m within close driving distance of Uwajimaya. You can use most types of miso, so if you have some generic yellow miso sitting in the fridge, feel free to use it, but the general rule of thumb is: the darker the miso, the heavier the taste and vice versa. Because black cod is so buttery, I find a light miso works best, but your own taste may prefer a salty version. In any case, DO NOT ADD SOY SAUCE. Miso is made with fermented soy beans and is naturally salty, so there is no reason to use soy sauce as I’ve seen in some recipes.
Let the sauce cool, place fish in a wide, shallow pan or container and then pour in sauce. Cover with plastic wrap and then toss and forget in the refrigerator for three days.
Place fillets on tray and bake in oven for 325 degrees for 15 minutes. While grilling might be possible, I don’t recommend it unless you foil your fish – otherwise it will come apart very easily.
Garnish with some chopped green onions and serve. Enjoy!
I almost forgot – if you’re too lazy to make your own black cod kasuzuke, Seattle is lucky to have a score of restaurants that make an excellent version. Here’s some restaurants to name a few: