Melt the butter in a pot. Important: don't let it get too hot!
2.
Put the egg yolks, lemon juice, water and salt into a pot and whisk with a mixer over a hot water bath until a creamy mixture forms.
3.
Take it off the heat and gradually add the liquid butter, stirring constantly. Make sure the sauce comes together well - better to stir a little more.With the Zauberstab hand blender, though, that's no problem!
