Drinking Cups and Their Customs by Henry Porter and George Roberts (1869, p.62) — Drinking Cups 1869

2 lemonlemon peel — lemon rindsacid
1 quartwhisky base
1 poundwhite currants — ripe white currantsgarnish
1 ounceginger — bruised gingerother
1 poundpowdered sugar — powdered loaf sugarsweetener
  1. Infuse whisky with lemon rinds, bruised ginger, and white currants in a covered vessel for a few days; strain carefully, add powdered sugar, and bottle two days later.

The source dedicates this to lovers of usquebaugh and says it was a favourite of Robert Burns.