Marion made this side dish for Thanksgiving one year and it was such a hit it has become a traditional part of the meal. The tanginess of the marinated grapes is a perfect foil for the richness of any fowl.
Place the grapes in a glass bowl or jar. If using a glass jar, use one with a nonreactive lid or cover the lid with plastic wrap (preferably Saran brand).
In a small stainless steel or enamel-coated pan, bring the remaining ingredients to a boil, stirring occasionally. Simmer the mixture for 5 minutes, then pour it over the grapes. Stir, cover tightly with plastic wrap or the lid, and a