Syrup of Maidenhair or Capillaire is a beverage. It is a syrup made from maidenhair fern leaves. The sweetened concentrate is mixed with a liquid, most commonly water or milk, before drinking.
In Portugal a drink called Capilè is made of syrup of maidenhair with grated lemon zest and cold water
In seventeenth-century Bavaria it entered was added to a hot drink made from eggs, milk, and tea.
In 18th century Europe it was used in a popular milk mixed drink.
George Smith (1799). The laboratory; or, School of arts. C. Whittingham for H. Symonds, 1799