In a small pot, place sugar, water and sage leaves. Bring to a boil over medium-low heat. Let simmer for 5 to 10 mins until sugar is fully dissolved and the liquid is thickened slightly.
Cocktail:
Place gin, sage syrup, Meyer Lemon juice and egg white in a cocktail shaker. Vigorously dry-shake(without ice) for about 15 seconds.
Add ice and shake again until chilled.
Double strain into cocktail glass and top with club soda.