Wash the woodruff well, shake it dry and let it wilt for several hours (preferably overnight).
Wash the lemons. Peel the peel of two lemons thinly, squeeze all lemons. Pour juice into a measuring cup and make up to 400 ml with water.
Bring liquid with sugar and lemon zest to a boil, add woodruff and simmer for 5 minutes. Cover and let steep for about 4 hours.
Pour mixture through a fine sieve. Squeeze the leaves well.
Boil the woodruff syrup again and fill into small bottles, seal immediately.