The Vesper Martini is a cocktail that combines gin, vodka, and Lillet Blanc, a French aperitif. It is famously associated with the fictional British secret agent James Bond, who orders it in the novel "Casino Royale" by Ian Fleming. The drink is typically served in a chilled martini glass and garnished with a lemon twist. To prepare a Vesper Martini, mix three parts gin, one part vodka, and half a part Lillet Blanc in a shaker with ice. Shake well and strain into the glass. The result is a crisp, refreshing drink with a unique flavor profile that distinguishes it from traditional martinis.