Step 1

Toss the grapes into a food processor and process them for 45 to 60 seconds, until they form 3 to 4 cups of a coarse and lumpy, vibrantly purple slurry. If your food processor is small, work in small batches until you’ve processed all the grapes.

Step 2

Transfer the puree to a saucepan, pour in the honey, and drop in the rosemary and black peppercorns. Simmer the mixture over medium-low heat for 15 to 20 minutes, until slightly thickened and deeply fragrant.

Step 3

Set a fine-mesh sieve over a large bowl and pour the puree into the sieve, straining out the grape seeds, rosemary, and peppercorns. Cover the bowl and transfer it to the refrigerator. Allow the puree to chill for at least 12 hours.

Step 4

Churn the puree in an ice cream maker according to the manufacturer’s instructions. Spoon the sorbet into a container, cover tightly, and store it in the freezer. It will keep for up to 2 weeks.