From The Webtender Wiki
"Cafe Royal Cocktail Book," by W. J. Tarling, 1937
Shake with Ice; Cocktail Glass.
"Trader Vic's Bartender's Guide" (1972)
- 1 part Kahlua
- 2 parts Tequila
Stir well with cracked ice. Strain into chilled cocktail glass. Add twist of lemon peel.