In a cocktail shaker filled with ice combine 25ml gin, 25ml white vermouth, and 25ml bitter bianco. Strain into a chilled cocktail glass garnished with a twist of orange and a sprig of rosemary.

To make a batch for a party, mix equal parts gin, white vermouth and bitter bianco in a jug and refrigerate. When it’s time to serve, pour the mixture in batches into a large jug filled with ice. Stir well before straining into chilled cocktail glasses, each garnished with a twist of orange and a sprig of rosemary.