For the steak frites with anchovy butter, first cream the butter with a hand mixer until fluffy. Stir in the chopped herbs, anchovies and the remaining ingredients and season with sea salt. Pour into a bowl and store temporarily in the refrigerator.
For the fries, peel the potatoes and cut into thick bars. Simmer in salted water for about 2 minutes, drain on a perforated tray and allow to steam out. Then deep-fry in hot fat at 170-175 °C until crispy, drain on a paper towel and sprinkle with sea salt flakes.
Season entrecote with sea salt and pepper. Heat canola oil in a frying pan and sear the steaks on both sides for 2 minutes. Then cook for 6-8 minutes at 140 °C medium and let rest in aluminum foil for another 5-8 minutes. Cut into slices.
Serve steak frites with anchovy butter.