Kremša (kremšnite)

Instructions

1. Preheat the oven to 200 °C (180 °C fan) and cut the puff pastry into two rectangles of the same size.
2. Prick the pastry with a fork and bake for 15 to 20 minutes, until nicely golden. Let it cool.
3. Make the cream: dissolve the flour and yolks in 100 ml of cold milk.
4. Heat the rest of the milk with the sugar and vanilla sugar until just simmering.
5. Pour the hot milk onto the egg mixture while whisking, then return everything to the pan.
6. Thicken over a low heat, stirring, until smooth, then stir in the butter off the heat.
7. Spread the cream over one cooled pastry sheet, cover with the second, chill for 3 hours, then cut and dust with icing sugar.