For the elderflower sorbet, first beat the aquafaba in a food processor with a whisk for about 5 minutes until stiff.
Then empty the syrup into the beaten egg whites and whisk again.
Freeze in the ice cream maker. If you don’t have a glacemaker, pour everything into a suitable container and put it in the freezer.
When the sorbet starts to solidify, whip with a mixer and refreeze.
Proceed in this way for another 3×. Portion the elderflower sorbet and serve.