For pickled grape clusters: Place grapes in several large clusters into large bowl. Combine the vinegar, sugar, salt, peppercorns, cloves and pepper flakes in a small saucepan and bring to a boil. Stir just until the sugar has dissolved and pour over the grapes. Cover and refrigerate at least 1 hour. Place into serving dish of choice, and serve with the cheese and crackers or bread.

For more intense flavor: Remove grapes from stems. With a sharp paring knife, cut an X in the stem end of each grape. Divide between 3 pint-size canning jars. Make pickling sauce according to directions, then pour over the grapes in each jar. Cover and refrigerate at least one hour.