For the apple in hiding, defrost the puff pastry. Peel apples, remove core and cut into eighths. Prepare a compote with some water, almonds, raisins and rum and let it cool down.
Cut the puff pastry in half and roll out a little. Spread the compote on it, moisten the edges, fold the dough and place it with the closed side down on a cold rinsed baking tray.
Cut three times. Prick the pastries several times, brush with egg yolk and let stand for 15 minutes.
Then sprinkle with sugar and bake in a preheated oven at 225 °C for about 20 minutes.