Reference point
A black cardamom pod charred over a flame, shelled, the seeds inside smelled.
Do this before you read on. An entry only works when you have just smelled the thing.
Smoke, camphor, and a deep sweetness at the very bottom. Heavy, lasting, and stays for a very long time. Together with doi seed, it is one of only two spicy entries that reach the base stage — and both are dried fruits or seeds, not fresh leaves or bark.
Raw and charred black cardamom differ so much that they should be treated as two ingredients. The raw pod has a coarse camphor note and is slightly pungent; charred, it is coated in smoke that rounds it off.
That is why every pho recipe asks for the black cardamom to be charred before it goes into the pot. It is not a ritual but a chemical operation with a purpose.
How to smell it
Char a black cardamom pod over a flame until the husk is blackened. Let it cool for a minute, shell it and smell the seeds. Compare with an uncharred pod smelled at the same time — the distance between the two is the work of the fire.
Why this one is hard
Because it always appears in complex spice mixtures, never on its own. Separating it from cinnamon, star anise and ginger means smelling each one on its own first.
Don’t confuse with
This entry
Black cardamom
Spicy family
Star anise is sweet, round and cool at the end; black cardamom is smoky and camphorous, much heavier.
This entry
Black cardamom
Spicy family
Black cardamom is heavy, smoky and in the base stage; amomum is light, cool and in the middle stage. The two pods look alike at dry-goods stalls.
Scientific note
Black cardamom contains 1,8-cineole together with aldehydes, so it has both the cool airiness of eucalyptus and the sharpness of citral. That combination explains why it holds its own in a pot of pho broth for hours without being drowned out: the cineole leaves early but the heavier part keeps releasing as the broth simmers.
1,8-Cineole is marked as leading because it is the identifying compound of black cardamom, but it boils at around 176 degrees and so leaves early. That black cardamom can still be smelled after hours in the broth is thanks to the heavier compounds that come with it. On a volatility band, the highlighted dot tells you the signature compound, not the duration.
In Vietnamese life
Black cardamom is grown under the forest canopy in Lao Cai and Ha Giang, and is one of the few native Vietnamese spice crops of high export value. It is also the most expensive ingredient in a packet of pho spices.