How do you make vinegar from an old wine. process please?
“The simplest is to leave an open, 3/4 filled bottle in a warm place for a couple of weeks. This technique yields just one bottle, however. For a steady supply of vinegar, take a wide-mouthed glass jug whose capacity is at least a gallon and pour a quart of wine and a cup of vinegar into it. Keep the container covered most of the time, but open it for a half hour every day. In a couple of weeks the madre, a viscous starter, will have settled to the bottom of the jug, while the vinegar above it will be ready for use.
