Rhubarb Gin Fizz Cocktails Spring in a Glass

Instructions:

1. Combine rhubarb, sugar, water, and lemon zest (if using) in a saucepan.
2. Bring to a simmer over medium heat, stirring until the sugar dissolves.
3. Reduce the heat and simmer for 15 minutes, or until the rhubarb is soft and pulpy.
4. Strain the syrup through a fine-mesh sieve or cheesecloth into a jar or container. Discard the solids (or save to make a rhubarb crumble topping!).
5. Let the syrup cool completely.
6. Fill a cocktail shaker with ice.
7. Add gin, rhubarb syrup, lemon juice, and egg white (if using) to the shaker.
8. Close the shaker tightly and shake vigorously for 15-20 seconds, or until well chilled. If using egg white, dry shake (no ice) first for 15 seconds, then add ice and shake again for another 15. This creates a better foam!
9. Strain the cocktail into a highball glass or coupe glass filled with ice.
10. Top with soda water.
11. Garnish with a rhubarb ribbon or a slice of lemon.