STIR jam and grapefruit juice in base of shaker until jam dissolves. Add other ingredients, SHAKE with ice and strain back into shaker. DRY SHAKE (without ice) and fine strain into chilled glass.
Orange zest shavings
Zingy, bittersweet ginger with a hefty dose of spirit smoothed by egg white.
Danny Wilson at Tabouche, Cambridge, England and a riff on his original La Bouche Reelle.