Wash the woodruff the day before and shake it dry. Tie the bouquet with kitchen string. Let it wilt overnight or freeze it once.
The next day, boil 450 ml water, sugar and lemon juice until the liquid is clear. Hang the woodruff upside down in the syrup so that the stems do not dip. Cover and leave to stand in a cool place for about 4 days. Pour the syrup through a very fine sieve and pour it into a hot rinsed, tightly closed bottle. The syrup keeps up to 4 weeks in a cool place.