Bring raspberries, 75 ml water, lemon juice, vanillin sugar and sugar to the boil in a pot. Let simmer for 1-2 minutes. Stir pudding powder and 6 tbsp. water until smooth. Stir into the boiling raspberries, bring to the boil and simmer for 1 minute while stirring.
Pour into a bowl and allow to cool. Stir several times.
Take the puff pastry out of the refrigerator 5-10 minutes before use. Unroll on a work surface on the baking paper. Spread with raspberry puree, leaving about 2.5 cm free on one long side.
Sprinkle evenly with coconut shavings.
Separate the egg. Whisk egg yolk and 2 tablespoons of water. Whisk egg white with a fork. Brush free long side of dough with egg white. Roll up the dough tightly towards the free long side using the baking paper.
Cut the roll with a sharp knife into about 16 slices. Carefully place the slices next to each other on a baking tray lined with baking paper with the cut surface facing downwards.
Brush the dough with egg yolk and bake in a preheated oven (electric cooker: 225 °C/ convection oven: 200 °C/ gas: see manufacturer) for 12-15 minutes. Remove from the oven and let cool on a cake rack.
Dust with icing sugar and possibly decorate with fresh raspberries.