Instructions

Mix the flour, salt and vanilla sugar. Add the cold diced butter and rub in with your fingertips.
Work in the egg yolk and crème fraîche until you have a smooth dough. Wrap and chill for 1 hour.
Preheat the oven to 200 °C.
Roll the dough out thinly and cut out squares about 8 cm across.
On each square, make cuts from the corners towards the centre, without cutting through. Fold alternate corners in to form a star.
Place a spoonful of jam in the centre of each star, then brush with egg yolk mixed with milk.
Bake for 12 minutes until golden brown. Leave to cool on a wire rack.

Cinnamon version. Add a pinch of cinnamon to the jam before filling the stars.

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