Monkfish sous vide with mint and basil

Our garden's overflowing with mint and a friend gave us a bunch of farmers' market basil, so we went with a Thai flavor to cook some monkfish. Since this fish takes a long time to cook, we used sous vide to keep it tender, poaching it in flavored oil in the water bath.

We stemmed the basil and mint, washed and dried, sliced fine, then poached it in some (fairly neutral) coconut oil to push the Thai flavor. We chilled that, with the herbs and the portioned monkfish so it would be solid when we vacuum bagged it: this worked well since the coconut oil sets just below room temperature.

A blog post tried a number of different temperatures and found 48C/118F to be the best so we heated the water bath and dropped the bagged fish and oil into it. Once the oil melted, we timed the cooking for 30 minutes. We use a Igloo Playmate cooler to minimize heat loss.

Meanwhile, Irene made a salad out of Malabar Spinach we'd gotten at the farmers' market. It's a more toothsome green so she dressed it early to allow the leaves to soften a bit. The dressing included lime juice, fish sauce, rice vinegar, sugar, salt, hot chili and sesame oil.

Once the fish was cooked, I strained the oil and seared the fish in cast iron with a bit of the oil.

We'd also gotten the season's first corn on the cob. We've made the grilled corn in the Pok Pok cookbook so we did a riff on that -- first cooking it in its husk in the microwave (our standard approach), then heating a bit more of the oil in a pan with some salt and chile flakes, giving it a little browning, then a lashing of fresh lemon juice.

What Worked, What Didn't

The sous vide was great for the monkfish. Cooking conventionally can dry out and toughen the outer area of the fish during the long cooking it needs, or leave the interior undercooked. This cooked it all the way through without overcooking. The time and temperature seemed fine.   The searing didn't add much texture, and that may be because my oil had a bit of the liquid from the herbs or fish so didn't produce a hard sear.

The oil did provide an attractive perfume to the fish, but not nearly so pronounced as we'd expected.  Afterwards, we chilled the oil so we could separate any herb/fish liquid from it, and plan to use the oil to poach squid -- mint and squid is a surprisingly good combination. The oil was fairly neutral with almost no coconut flavor; this is a good thing in most preps, but here we could have used more Thai stylings.

The corn finished in fat with spices and citrus is something we've taken to recently, and it worked here as well. An assertive coconut-flavored oil would take it in a more Thai-flavored direction.

We've never had this spinach before, but it turned out well. The plants are also said to like hot weather so would grow well in our garden when the rest of our salad greens have bolted or withered.

Next Time...

I'd like a good sear so maybe we could use a little fresh oil to avoid any chance of water-based liquid and also since the heat might be driving off the herbal aromatics. Or finish under the broiler or with our Searzall.

I'd also pre-cut the monkfish into medallions before bagging them in the oil. This should allow better flavor penetration and more surface area to sear.