When I ate Boudreaux's salmon filet with mushrooms, the charred skin was crisp as a slice of perfectly cooked bacon. A perfect contrast to the moist, sweet flesh.
He reveals the secret in the video. A carbon steel pan. That's it. The pan takes an incredible amount of heat. Up to 700F. The skin sizzles and in seconds is perfectly seared. A quick flip to char the flesh and then into a 350F oven to cook the filet on the inside.
After I bought a pan and seasoned it and used it successfully on a fish filet, I discovered the pan's other advantage. Easy clean up. Very much like a cut-down wok, the pan needs only a quick cleaning with a soapy sponge to remove the left-over oil, heated again on the stove top to burn off the water and that's it. No strenuously scrubbing to clean the pan the way I had done for years with the stainless steel pans I relied upon. Just a quick clean up and I was done.
A cast iron pan also works well at high heat, but from my experience the carbon steel pan does a better job. Both pans are relatively inexpensive. A carbon steel pan will cost half the price of a comparably sized, quality stainless steel pan. When you shop for a carbon steel pan, buy one that is made with a thicker gauge steel. I have been using de Buyer pans. Chef Boudreaux recommends Matfer Bourgeat. The advantage of the thicker gauge pans is they retain heat longer than the pans made with a thinner steel.
Cast iron pans are easy to find. Carbon steel pans, not as much. In the Los Angeles area, the only source for the pans is Surfas Culinary District. In New York, I have seen them upstairs at Zabar's.
Recently, I have seen a great many De Buyer pans on Amazon. I recommend looking there. Given the variety of De Buyer pans, I recommend the frying pans, not the pans with higher, rounded sides and frying pans with smooth bottoms. The ribbed bottoms are excellent to create grill marks, but the ribs inhibit good sautéing.
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