Cocktail #24. French 75, Death & Co

Cocktail #24. French 75
Source: Death & Co Modern Classic Cocktails, David Kaplan

Recipe:
1 shot Gin
1/2 shot Lemon juice
1/4 shot Sugar Syrup
Dry champagne

Shake all the ingredients (except the champagne) with ice, then strain into a flute. Top up with champagne and garnish with a lemon twist.