You can make pickled beets with the precooked beets sold in vacuum-packs in the produce section of the supermarket.
2 8oz. packages of cooked beets. Plain beets with no added flavorings or spices 1 red onion, cut into thin slices 1/4 cup pitted olives 1 teaspoon rosemary 1/4 cup wine vinegar 1/2 cup extra virgin olive oil
Put beets, onions and olives into a bowl. Mix rosemary, vinegar and oil and then pour over the beets and onions in the bowl. Pack mixture into a glass jar and refrigerate.