It's the day you pull the last Korean radishes and green onions from the garden before the first frost. You set a chunk of meat in a pot and start picking spices for the simmering water. If there's a bag next to the star anise and cinnamon holding small oval pods covered in soft bumps, those pods are sain, or amomum.
Amomum is the cluster of seeds inside the fruit of a plant in the ginger family. Herbal medicine shops also sell it as chuksain (縮砂仁). Peel the husk off a dried pod and you'll find brown-to-blackish seeds packed into three clumps. The plant is tropical and grows in the shade of subtropical forests, where the average annual temperature is 19–22°C and rain is frequent. It can't survive frost, and its leaves are damaged below 3°C. It grows best at 22–28°C and won't grow in direct sun, so it's cultivated under tall trees. Most of the harvest comes from its native range of China, Vietnam, and Laos. In places that get frost, cooks buy the dried pods.
The Oil in the Seeds
Most of amomum's aroma comes from a group of volatile compounds called essential oil. An analysis of amomum's essential oil found compounds such as bornyl acetate and camphor. Bornyl acetate gives a cool, slightly sweet scent, and camphor adds a sharp, pungent edge.
The same analysis also found that the essential oil is concentrated in the seeds rather than the husk. The husk is mostly fiber, and it gets rubbed off and thrown away during prep. If you want the fragrance, use the seeds inside.
It Reaches Your Nose and Tongue First
Amomum first reaches the body through the nose and tongue. Essential oil evaporates easily, so the aroma spreads the moment you crush the seeds. On the tongue, it leaves a lingering, peppery heat. When you add it to a pot of simmering meat along with star anise and cinnamon, the gamey smell fades, likely because this aroma covers it.
But the analysis in our reference guide is only about scent. The guide doesn't yet include any data showing what changes in the body after you eat amomum. For now, all we can say is that it masks food odors and adds fragrance. Any effect beyond that has yet to be confirmed.
Chuksamil in the Donguibogam
The Donguibogam, a medical classic from Korea's Joseon dynasty, lists amomum under the name chuksamil (縮砂蜜) in its section on plants, Chobu (草部), and gives sain (砂仁) as another name. It describes amomum as warm in nature, pungent in taste, and nontoxic. According to the text, the fruit looks like baekdugu (白豆蔲, white cardamom) but is slightly darker, and it also resembles ikji (益智, sharp-leaf galangal fruit). The book says it is gathered in the seventh and eighth lunar months.
The same book also explains how to prepare it: toast it over low heat until fragrant, rub off the husks, and pound only the seeds. That matches today's analysis showing the aroma is in the seeds. Keep in mind, though, that calling it "warm" follows the classification system of old medical texts, which differs from modern standards.
When to Grind, When to Add
Once the seeds are ground, the essential oil escapes into the air and the aroma weakens. So buy whole pods and shell only as many as you need right before cooking. To follow the traditional method, toast the pods in a dry pan over low heat until fragrant, rub off the husks between your palms, and pound the seeds in a mortar.
- Simmering meat: Use it with star anise and cinnamon, but add the amomum later than the other spices. A cotton spice bag makes it easy to fish out.
- Broths and decoctions: Long simmering drives off the essential oil, so little aroma is left. Add it about 5 minutes before you turn off the heat, then cover the pot. Traditional Korean medicine is said to have added amomum late for the same reason.
- Storage: The aroma lasts longest in whole, unshelled pods. Once the bag is open, move them to an airtight container and keep it in a cool, dry place. Put anything you plan to keep for a long time in the freezer.
If you're simmering meat today, shell a few amomum pods, grind just the seeds, and add them to the pot 5 minutes before you turn off the heat. Smell the discarded husks, then the ground seeds, and your nose will tell you which one holds the essential oil.
