The Shortening Method
Gently heat four parts shortening over low heat until liquified. Watch that it doesn’t burn. Add one part dried herbal mixture, blend with a wooden spoon until thoroughly mixed, and continue heating until the shortening has extracted the scent. You should be able to smell it in the air.
Strain through cheesecloth into a heat-proof container, such as a canning jar. Add one-half teaspoon tincture of benzoin to each pint of ointment as a natural preservative. Store in a cool, dark place, such as the refrigerator. Ointments should last for weeks or months. Discard any that turn moldy, and lay in a fresh batch.