While visiting his friend Tim Rita, head bartender at Lewers Lounge in Honolulu's Halekulani hotel, Francesco Lafranconi came up with the idea to create a cocktail using the hotel's house-made poha berry (a.k.a. Cape gooseberry) jam.
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Fill a cocktail shaker with ice. Add the gin, Grand Marnier, lime juice and jam and shake well. Strain the drink into a chilled coupe and add the bitters. Garnish with the lime leaf.