Combine ingredients in a mixer tin, shake vigorously with ice, and double-strain into a coupe glass half-rimmed with a mixture of sugar and salt (3:1).
Garam masala simple syrup can be made with 2 cups Demerara sugar, 1 cup of water, and 2 tsp. garam masala powder. Mix ingredients, simmer together, and allow to cool. Final product may require straining to remove fine powder.