Place the greengages and mint leaves into a cocktail shaker and crush lightly (muddle) with a long-handled spoon.
Add the lime juice and plum syrup and stir well.
Add the vodka, wine and ice and shake well.
To serve, half-fill a tumbler with crushed ice, then strain the mixture over the ice. Garnish the glass with the remaining mint sprig and wedge of greengage.
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