For this year special edition of homemade elderberry flower (Sambucus nigra) soda, I used 3 liters of water, 12 big flowers, 300g of honey and 1 lemon, sliced. The bottles or the big jar must stay in a warm place, like in a sunny balcony, covered with a gauze. Every day, for about 3-5 days, the juice must be slightly stirred, until it becomes fizzy. For a refreshing drink, keep it in the fridge, with the cap very well sealed, as the fermentation process may continue. It lasts for 4-6 weeks.