Chill a coupe glass in the freezer or fill with ice while you make the drink.
Add the gin, cherry syrup, lemon juice, and egg white to a cocktail shaker without ice.
Shake hard for 15 seconds. This is the dry shake - it emulsifies the egg white and creates the foam.
Add a generous handful of ice and shake again for 15 seconds until well chilled.
Tip the ice from the coupe glass and strain the cocktail in.
Garnish with fresh cherries on a skewer.
Notes
Cherry Simple Syrup:To make the cherry syrup: combine 1½ cups cherries (pits and all), 1 cup sugar, 1 cup water, ½ tbsp lemon juice, and ¼ tsp almond extract in a saucepan. Simmer 5 minutes, then steep off the heat until cool before straining. Full recipe at cherry simple syrup.
The dry shake (without ice first) is essential for the silky foam.
Make your cherry syrup ahead of time so it's completely cool before using. It keeps in the fridge for two weeks.
For a vegan version, swap the egg white for 1/2 oz (15 ml) aquafaba (the liquid from a can of chickpeas). It froths up just as well.
To make as a batch: mix the gin, syrup, and lemon juice ahead of time and store in the fridge. Add the egg white or aquafaba fresh to each drink when shaking.
One lemon gives you approximately 1 oz (30 ml) of juice.