A White Cadillac drink is only one of several "Cadillac" cocktails that rely on the Italian sweet liqueur called Galliano for its main flavor. Galliano is distilled with 30 different herbs and spices that combine to give the product a sweet, herbal flavor. Triple sec is the second main flavor component of the cocktail and has a distinctive orange flavor from the sun-dried orange peels that are used to make the liqueur. When all the ingredients of the White Cadillac are combined, the result is a drink with a high alcohol content and a deceptively innocent vanilla milkshake-like flavor.
Pour 1/4 cup each of Galliano, gin, triple sec, milk and sugar into a cocktail shaker filled to the top with ice.
Pour the mixture through the shaker's top strainer into two chilled martini glasses.