The earliest reference of this cocktail is found Trader Vics ‘Book of Food and Drink’ in 1946, and it's unclear whether or not it is a Trader Vic original.
Ingredients
1.5 oz Tequila or Mezcal
0.75 oz lime juice or (2 or 3 lime wedges squeezed and thrown in bottom of glass)
0.5 oz Creme de Cassis (Edmond Briottet)
Ginger Beer
You can add the creme de cassis at the end which creates a nice cascading color within the drink.
Method
Creme de Cassis: Blackcurrant liqueur originating in France created by macerating black currants. Original recipe by Aguste-Denis Lagoute in the Dijon region of France in 1841. The best brands have at least 600g of black currant per liter
The earliest reference of this cocktail is found Trader Vics ‘Book of Food and Drink’ in 1946, and it's unclear whether or not it is a Trader Vic original.