This is my weeknight version of a classic Louisiana cooking technique. The original technique of blackening comes from a Louisiana icon: Chef Paul Prudhomme. The original technique calls for dipping the protein, often Salmon or Redfish, in melted butter and then a mix of spices, like a local Louisiana Masala. Blackening often has a few spices like mustard, garlic and ginger that offer a mild tingle, mixed with a few like cayenne pepper that pack a lot of heat. Traditionally, you let the butter firm up on the fish with the spices like a buttery spicy shell and sear it in a roaring hot (usually cast iron) pan. It forms almost a crust, with extra fat from the butter, which is both charred and spicy. I like to "sift" an even layer of spices over the fish. If you don't have a strainer or sieve, sprinkle over the fish directly. I love Tuscan kale the most and it is the most easily found in supermarkets. The sturdy leaves pack a taste that reminds me of leafy spinach mixed with a stronger mystery cousin. The Kale is made tender by absorbing the olive oil it is tossed with and not from acidic ingredients like vinegar and lime juice, a tidbit I learned from food guru J. Kenji Lopez-Alt.