1. In a small pot combine the sugar, spiced brandy, water, black peppercorn and cinnamon stick. 2. Bring to a boil, stirring until sugar is dissolved. 3. Cover pot and let set at room temperature for one hour. 4. Strain the syrup through a sieve, whisk in the blackberry puree, vinegar and chill until cold. 5. Transfer to the bowl of an ice-cream machine and freeze according to the manufacturer instruction.
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