Carefully wash the meadowsweet plants and bring to the boil with the water and sugar for about 5 minutes. Then remove the plants and continue to boil the sugar water until it has turned a little syrupy, about 7 minutes.
Fill into a clean bottle with a funnel and pour the vodka on top. The plants are then placed in the bottle. It is important to take a high percentage alcohol, then this liqueur will keep indefinitely.