Here's a recipe for a very refreshing and tasty drink:

Ingredients:
2 l water
2 kg sugar
15 elder flower clusters (Sambuci Flos)
2 handfuls linden inflorescence (Tiliae Flos)
2 lemons

Make a mixture of water, sugar, lemon juice. Slice lemons and add them to the mixture. Add the flowers, WITHOUT previously washing them. Check for insects, dirt or small leaves. Put the mixture into a big jar and let it stand for 3-4 days. Strain through a cloth . Sterilise your bottles by putting them in an oven, on low heat, for about 10 minutes. Fill in the bottles and store in a cool, dark place.

Add a small cantity to a glass, along with, if you like, some fresh lemon juice. On hot days, serve with ice cubes and slices of lime/lemon.

Health benefits:
Lime flowers have a calming effect, which is why they are often used in cases of insomnia. It is a successful remedy against anxiety.