Place the pineapple in a sterile glass jar or bottle. Add sugar to taste, if the fruit is not sweet enough. Pour the vinegar over the fruit.
Cover and store in a cool, dark place for 6 to 14 days, checking for strength of flavor that you like.
Strain through cheesecloth or a paper coffee filter and refrigerate.
c.1996, M.S. Milliken & S. Feniger, all rights reserved