Ajwain vs thyme
A seed and a leaf that share a dominant compound and therefore an aroma. Ajwain smells so strongly of thyme that people assume it is one, and it is a carrot-family seed.
botanical
What is being compared
Why these get confused
Ajwain is a seed that smells like a herb, which makes it hard to place on first meeting.
Point by point
| Aspect | Ajwain | Thyme |
|---|---|---|
| What it is | A tiny ridged Apiaceae seed, grown almost entirely in India. | Thymus vulgaris, a mint-family leaf native to Morocco, Spain, southern France and south-eastern Italy. |
| Form | Whole seed; it is small enough that grinding is rarely needed. | Dried leaf, which holds up well. |
| Why they smell alike | Both are dominated by thymol, which is why the seed reads as a herb. | The same compound, present less strongly. |
| Intensity | Far stronger. A pinch is a large quantity and a teaspoon is undrinkable. | Assertive but manageable at ordinary herb quantities. |
| As a drink | Omam water is a South Indian household preparation. | Brewed across the Mediterranean and the Levant, generally with honey. |
| Shelf confusion | Sold as carom seed and confused with celery seed, which is a different flavour. | Several Thymus species and cultivars, and lemon thyme is quite distinct. |
The short answer
If a recipe wants a thyme note in a hot drink and you have ajwain, use a quarter of what you would use of thyme. In the other direction the substitution barely works at all.
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