Angels' Advocate

Select and pre-chill a martini glass.

Prepare an orange zest twist for garnish, ensuring it can be shaped into a cross.

Shake the Hayman's London Dry Gin, Advocaat liqueur, Monin Vanilla Syrup, freshly squeezed lemon juice, and cardamom bitters with ice until well-chilled.

Fine strain the mixture into the chilled martini glass.

Express the orange zest over the cocktail to release its oils, then place it on the drink to form a cross shape as garnish.