When you're ready to bake the next day knock back the dough and divide into 10 (65g) or 14 (46g) even pieces. Roll each piece in turn on a lightly floured work surface using your cupped hand until it forms a smooth bun. Place the buns on a baking sheet lined with greaseproof paper. Leave to prove covered for 45-60 minutes depending on the room temperature. (To speed the proving up you can place the buns in the oven, SWITCHED OFF with a bowl of freshly boiled water, don’t cover them).
Meanwhile pre-heat the oven 190°C fan/Gas 7.
Brush each bun with egg wash and then bake in the centre of the oven for 12-14 minutes or until golden brown. Leave to cool on a wire rack.
Once the buns have cooled, they need to be hollowed out. You can either cut a triangle or literally slice the top off, then scoop out a little of the insides. Keep half of the crumbles and place in a bowl with 200g almond paste. Now add 2 tablespoons of milk, and mix to form a paste. It should be a nice soft pipe-able consistency, you may have to add more milk.
Add 1-2 teaspoons of icing sugar and the vanilla extract to the cream and whip until the cream just holds its form.
Fill the buns with the almond mixture using a spoon or a piping bag. Pipe or spoon the cream on top and then put the tops back on. Dust with icing sugar and enjoy.
Eat on the day, or day after baking. Store in a plastic container with a lid in the fridge.