2 oz. gin (Note: if you prefer Vodka over Gin, use 4 oz of Vodka)
2 oz. lavender simple syrup, divided
1 1⁄2 oz. lemon juice, divided
2 egg whites, divided
Club soda, to top
For the simple syrup: Bring sugar and 1 cup water to a boil in a 1-qt. saucepan. Cook, stirring, until sugar is dissolved, about 1 minute. Remove from heat and stir in lavender; let cool to room temperature and strain. Makes about 1 cup, will keep for up to 2 weeks in the refrigerator.
For the cocktail: Combine vodka, 1 oz. lavender simple syrup, ¾ oz. lemon juice, and one egg white in a cocktail shaker filled with ice. Shake vigorously and strain into a chilled champagne coupe. Top with splash of club soda and spoon egg white foam from shaker over the top. Repeat process with gin for the second drink.