A tea made by pouring boiling water over an herb and allowing it to steep, covered, with no additional heat source.
Infusions generally have a short shelf life.
Prepare as needed. A thick herbal tea or soup made by boiling the herb in water for as long as desired. That is, boil it in water, then simmer it, covered, until you have a thick brew with very little water. Cool, and strain the boiled herb into the brew. Add an equal amount of vegetable glycerine to the thick decoction and mix well.