Cooling Cups and Dainty Drinks by William Terrington (1869, p.190) — Terrington 1869

3 wholeegg yolk — egg yolksbase
3 tablespoonfulswater — cold waterdilution
0.5 pintwater — Make hot with the wine mixture.dilution
2 dropsbalsam of Peru other
0.5 pintwhite wine other
2 ozsugar sweetener
  1. Beat the egg yolks with the cold water.
  2. Make a hot mixture of the white wine, balsam of Peru, sugar, and water.
  3. Add the hot mixture to the beaten yolks while stirring and drink while frothy.

Chorister extends Terrington's ecclesiastical-title cluster into a lighter white-wine-and-egg restorative form.

Its identity depends on maintaining a warm froth rather than clarifying or long holding.

See also: Beadle, Bishop a la Cutler, Mulled Egg-wine

The text says it is to be drunk while in a state of froth.