Butter yolk cream

1. 

egg yolk 2 pcs • sugar granulated 2 oz (60 g)

Whisk the egg yolks and sugar into foam.

2. 

Put into a steam bath and cook until thickened. Let it cool to room temperature ...

3. 

unsalted butter 7 oz (200 g)

... and add sliced, softened butter.

4. 

Whip into the foam.