I am giving directions for 1 pint jar, but you can make as many pints as you want. They get better after a day or so of marinating, and last for a week or so. The vinegar turns a nice rosy color. Keep refrigerated - they are best when chilled. This is my version of a recipe I found.
Put the grapes in a pint jar. I like to use a mixture of red, green, and black. Use nice sweet ones. Put the rest of the ingredients into a small saucepan and heat to a boil. Remove from heat as soon as it boils, and pour over the grapes. Add enough hot water to make it cover the grapes. When this has cooled, screw the lid on and refrigerate overnight, or at least 4 hours.
Source: From "The Lee Bros. Simple Fresh Southern" by Matt Lee and Ted Lee. They add more salt, less sugar, hot pepper flakes instead of a fresh pepper, and they add a sprig of rosemary.
By Free2B from North Royalton, OH