Herb vinegar от John Spottiswood

Herb vinegars are a convenient way to preserve fresh herbs and to incorporate their flavor into salad dressings, marinades, and sauces. They're easy to make at home. Just put one or two sprigs of clean, fresh herbs in a bottle of warm vinegar, tightly seal the bottle, and let it stand for at least a few days. The sprigs will eventually become bitter, so remove or replace them after a few weeks. Make sure that the vinegar you use has an acidity level of at least 5% (this information is given on the label). Wine, rice, or cider vinegars are good bases for most herb vinegars. Don't add too many herbs to the bottle, or you may reduce the acidity of the vinegar so much that it loses its ability to preserve.