Fill your shaker with the designated volume of ice to cool the ingredients quickly.

Add the gin, hazelnut liqueur, chocolate liqueur, and double cream into the shaker.

Seal the shaker tightly and shake vigorously, allowing the flavors to blend harmoniously while chilling the mixture.

Once thoroughly shaken, strain the blend into your chosen martini glass, ensuring a smooth pour without ice fragments.

Garnish with a sprinkle of crushed hazelnut or a dash of ground nutmeg to both flavor and decorate your martini.