To take this in a mocha direction, add 1 ounce chocolate syrup (we like Monin brand best), and cut the simple syrup to 1/2 ounce.
- 2 oz. strong cold-brew coffee
Combine coffee and simple syrup in a cocktail shaker. Fill shaker with ice and shake vigorously (this is important; put some muscle into it!) until outside of shaker is frosty and drink is light and frothy, about 45 seconds. Strain into a small tumbler.