From our recipe book # 1! 
Elderflower syrup :
25 elder cymes
1 liter of water
1.5 kg of granulated sugar
1/2 lemon
1/4 orange
25 g of citric acid
Mint / lemon balm if you like
Preparation:
Boil water with sugar, stirring constantly - allow to cool.
Add the remaining ingredients and let cool for 24h.
Strain and bottle.
Our recommendation for hot summer days:
Ice-cooled Prosecco with fresh, homemade elderflower syrup 
🥂
Good succeed! 