Using water, boil the granulated sugar to 122°c.
Remove the pan with sugar syrup from the heat and add the orange blossom water and the orange zest.
Gently stir the orange blossom water and the zests into the sugar syrup.
Pour the mass into two basins.
Repeat this process continuously until the mass cools down to 30°C.
Sieve the mixture so that the zest is extracted from the sugar syrup.
Using a piping bag, squeeze the sugar syrup into the truffle shells.
Leave the truffle shells to stand for 12 hours, in order for a thin crystallization layer to form.