Have one on me. It worked for Bob & Norma in Riptide:
* 1 ounces gin
* 1/4 ounce lemon juice
* 1/8 ounce simple syrup
* 5 ounces chilled champagne
Shake gin, lemon juice, and syrup with ice. Strain into a champagne flute. Top with champagne.
Expatriating 'Round Euro Hotspots
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