Preheat a cast iron or DeBuyer pan on moderate heat.
Put the egg yolks in a small bowl and add the soy sauce.
Tap the meat with a paper towel and season with Maldon salt and black pepper.
Add the meat to the pan and cook on medium heat until the fat is rendered.
Turn on the heat and continue cooking until medium well.
Take the meat out on a board, season with some extra salt and allow to rest for about 3 minutes before thinly slicing it.
To serve, divide the salad in two bowls, add the slices of Secreto and the egg yolk.