Sidecar Cocktail (Difford's spec.)
Orange zest twist (a lemon zest twist is more classic). Some also like a sugared rim but hopefully added Pineau des Charentes richness renders this sweet rim embellishment superfluous.
SHAKE all ingredients with ice and fine strain into chilled glass.
[['3.75 cl', 'Rémy Martin 1738 Cognac'], ['2.5 cl', 'De Kuyper Triple Sec (40%)'], ['1.25 cl', 'Lemon juice (freshly squeezed)'], ['1 cl', 'Pineau des Charentes blanc'], ['0.75 cl', 'Chilled water (omit if using wet ice)']]
[['3.75 cl', 'cognac'], ['2.5 cl', 'triple sec'], ['1.25 cl', 'lemon juice'], ['1 cl', 'pineau des charentes blanc'], ['0.75 cl', 'chilled water']]