A simple definition of decoction would be a simmered herbal tea. Decoctions are often best for harder botanicals like roots or seeds that are not as readily infused by steeping in a teapot. A solid standard ratio of plant matter to water is 1oz herbs to 32 oz water.
32 oz water
Bring the herbs to a low boil and simmer for around 15 minutes (some decoctions prefer to be simmered with the lid on, depending on the aromatics of ingredients)
Remove from heat and let stand for another 10 min
Strain and enjoy
Decoctions have a couple other uses aside from being used as a healthful beverage. You can add decoctions to baths for soaking. Another application is as a compress. Apply a clean cloth, soaked in warm decoction solution to the affected area, and keep it in place until it cools.
Rishi Tea & Botanicals includes instruction on how to brew for each of our products, including the brewing method. Generally, brewing instructions with water temperature, steep time, and dosage are found on our packaging. No matter how you plan to brew your tea, check out our brewing guides with videos and step-by-step instructions.