Gutting, cleaning, souring and salting the sole. Now turn in flour and tap carefully until only a very delicate layer sticks to the sole.
Melt half of the butter in a large pan and fry the sole on both sides for 3-4 minutes.
Meanwhile, heat the other half of the butter in a saucepan until it starts to brown and tastes nutty. Add the chopped parsley, froth up once and immediately place the casserole in a cold water bath to stop the butter from browning.
Arrange the sole on preheated plates and nap with the parsley butter.