Wash and dry the grapes, then pull their stems out. Using a paring knife, cut away the stem end of each grape, exposing a little of the grape’s flesh. Place them in one or two clean and dry canning jars.
In a medium saucepan, combine the vinegar, sugar, and the spices. Put it over medium heat until it boils.
Pour the liquid over the grapes. Once it is cool, place the jar in the refrigerator for at least 8 hours. Serve it cold.