2 kg brown sugar
4 lemons (bio lemon is best)
30 drops of lemon flavour
1 tablespoonful of tartaric acid
4,5 l water
5l jar made of white glas
Wash the lemons and cut them in two. Squeeze them into the jar. Add the lemon flavour drops and the sugar. Pour water on it and stir. Add the queezed lemons and the elders. Add the tartaric acid. Close the jar and take it to the balcony. In 4 days filter the liquid. Put it into the fridge for at least 2 hours. Stir 3 tablespoonfuls of the sirup in 2 dl of water.
It's even more refreshing with some leaves of mint.