Drain the apricots well on a sieve. Place the puff pastry in a tart tin (29 cm Ø) and let the edges overlap a little. Prick the base several times with a fork and sprinkle ground hazelnuts over it. Spread the apricots close together on the base with the convex side facing upwards. Warm the apricot jam briefly.
Spread on the apricots. Slice or finely chop the hazelnut kernels. Sprinkle over the tart and bake in the preheated oven (electric: 225 ° C/ gas: level 4) for 20-25 minutes. Serve with vanilla sauce refined with egg liqueur