Gently wash the elderflower flowers and trim their stems.
Put them in a big jar and add the sugar on top.
Squeeze the juice of two lemons, and add it on top.
Cut the rest of the lemons on slices, squeeze them inside the jar, and add them inside as well.
Fill the jar with water and mix all ingredients well but gently with a wooden spoon.
Cover the jar with a plate (not with its original lid), to leave space for breathing but protect from bugs.
Put the jar outside preferably, in full sun.
Mix the drink twice a day.
After 3-4 days, depending on the sun and warm weather, the socata should be ready. It is ready when it gets a slight fizziness, becomes cloudy, and the flowers descend towards the bottom of the jar.
Strain the drink through a sieve, and store in bottles, in the fridge.
Enjoy it cold, with extra slices of lemon.