A sweet-and-slightly-sour drink, that can be traced back to the middle ages. This recipe uses mint but you can substitute other herbs, like thyme, lavender, rosemary, sage or medicinal herbs for different flavors and purposes.
Sugar-free variation: Increase water to 3 cups. Simmer water, mint and vinegar for 30 minutes. When cool, add liquid or powdered Stevia-based sweetener to taste.