Begin by brining the fish. This is done by sprinkling it with a good layer of salt and letting it sit at room temperature for about 30 minutes. Then rinse the fish and dry it thoroughly with a tea towel.
Heat a pan with oil. Place the fish on it, and after about 30 seconds, add butter. Place a lemon slice and a sprig of thyme on each piece of fish and fry them over medium-high heat for 12 minutes.
Flip the fish and give the pieces 30 seconds on the other side.
Remove the fish from the pan and sprinkle it with a good flake salt.
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Notes
Brining is an age-old method that has been used for centuries. It involves drawing out some of the liquid from the meat using salt, thereby obtaining a firmer and more flavorful piece of meat.