Vesper Martini

1.5 oz Gin

0.5 oz Vodka

0.25 oz Kina or Cocchi (optionally, Lillet + Aromatic Bitters + Citric Acid)

Dash grapefuit or orange bitters

Lemon Twist Shake (preferably Stir) with ice. 

Double strain into chilled glass.

Garnish with Lemon Twist.