One to break the egg in a small saucepan, then it is possible to boil the cream if you take double or triple the dose, the capacity should be more.

To the egg add 1 tablespoon flour and 1 tablespoon of starch and grind (I rubbed it with a mixer) until smooth

Flour, starch

To 400 ml of milk add 2-3 tablespoons of sugar and vanilla sugar (or vanilla), a pinch of salt and heat, stirring constantly (I have a gas stove)

Once the milk warms up, a thin stream, stirring, pour it into the egg-flour-starch mixture learning. Future cream, intensively stirring, put on the stove and cook over high heat. As soon as begins to thicken, make the smallest fire, Saphala - remove from heat. Hot custard to achieve greater uniformity, grind spoon. Add the butter (in the hot cream) and a good stir. The cream is ready

Ready cream to cool to room temperature and fill them with cakes.