Today, I saw how elderflower cordial is made. The neighbour has a huge elder tree in the countryside and we were given the permission to cut off the flowers to make cordial. It is very common in Sweden to make this cordial which is also known as fläderblomssaft (pronounced as fleh-der bloms saft and it means elder flower cordial). This cordial is made during summer as the flowers are in full bloom somewhere in the middle of June. This cordial contains so much sugar, by the way! I was so surprised by the amount of sugar, and I understand now why it is so sweet and the cordial is diluted with a lot of water.
First, rinse and dry the flower clusters. Then, boil a huge pot of water with sugar in it. Add citric acid. Citric acid is added to preserve the cordial. The amount varies according to recipe. Turn off the heat.