Put the milk in a pot and boil it.

Put the egg yolk in a bowl.

Add Sechuan Sugar and mix well.

While stirring, add boiling milk.

Put everything back in the pot and heat it up.

Mix some corn flour with some water in a small bowl.

Empty it while stirring into the cream in the pot and heat it up.

When the cream's thickened, put it in the fridge.