Start with clean, dry or thoroughly washed fresh herbs.
In a medium saucepan, place vinegar, parsley, thyme, rosemary and sage; bring to a boil. Reduce heat and simmer, covered, for 5 minutes.
Pour mixture into a 1-quart jar; cover and set aside for 2 weeks, shaking occasionally.
Strain out herbs. Pour vinegar into bottles with tight fitting covers, adding a sprig of parsley, if desired. Use in salad dressings, marinades for beef or sprinkle over vegetables.