Liquefy the butter and warm it well. In a bowl, stir the two egg yolks with the mustard until well blended and slightly warm. Remove the saucepan from the stove and gradually add the warm butter, stirring continuously until everything is combined into a creamy mixture. Return the saucepan to the stove and add the yogurt, stirring continuously. Continue stirring while letting the sauce get hot, Tastes exceptionally good with haddock fillet or other lean fish.
Preparation time : 10
Tip: Use regular or light yogurt as needed!