The small, ridged seed of an Indian annual in the carrot family, packed with thymol, so it tastes like a fierce, peppery thyme. Used in parathas, pakora batters, dals and fried fish.
What it is¶
Ajwain (also spelled ajowan) is the dried fruit of Trachyspermum ammi, an annual in the carrot family. The seeds are tiny, about 2 mm long, greyish-brown and ridged, and look like very small cumin or caraway seeds. In English it is often called carom seed, and sometimes "bishop's weed", a name also used for several unrelated plants.
Its flavour comes from thymol, the same compound that gives thyme its character. Ajwain has much more of it than thyme does, so a few seeds go a long way.
Origins and history¶
The plant's exact origin is uncertain; it has been cultivated for a long time from Egypt and the eastern Mediterranean through Iran and Afghanistan to India, and its old botanical name copticum points to Egypt. India became the main centre of cultivation and use, and ajwain features in Ayurvedic and Unani traditions as a digestive, which is the context in which it is still most often discussed in India.
Thymol was once extracted commercially from ajwain seed, and the oil was an important source of it before synthetic production.
Flavour and aroma¶
Chewed raw, ajwain is startlingly strong: hot, peppery, numbing and very like thyme, with a bitter edge. Cooking tames it considerably. Fried briefly in oil or ghee, it becomes aromatic, savoury and much more rounded, and in doughs and batters it gives a pleasant herbal lift. It is best thought of as an accent, not a main flavour.
In the kitchen¶
Ajwain is especially associated with North Indian, Punjabi, Rajasthani and Gujarati cooking, and with foods that are fried or starchy.
- Breads. A pinch in the dough for parathas, puris and ajwain wale paratha; in mathri, crisp savoury crackers.
- Batters. Pakoras, bhajis and Amritsari fried fish are commonly seasoned with ajwain.
- Pulses. Dals, chickpeas and bean dishes, often added in a final tempering.
- Snacks. Namkeen mixes and bhujia sev.
- Vegetables. Excellent with root vegetables, green beans and okra.
- Beyond India. Ajwain is used in parts of the Middle East, Afghanistan and Ethiopia, and pairs surprisingly well with roast potatoes and lamb.
Use sparingly: ¼–½ tsp for a dal for four, and about ½ tsp per 250 g flour in a dough. Rub the seeds between your palms before adding them; this crushes them slightly and releases aroma. For tempering, fry for a few seconds in hot ghee until fragrant, then pour over the dish. They burn quickly and turn bitter if left too long.
Buying and storing¶
Whole seed keeps for two years or more in an airtight jar. It is rarely sold ground and there is little reason to grind it; crush it by hand as needed. Check for grit and chaff.
Substitutes¶
Dried thyme is the natural substitute: use about twice the quantity. Dried oregano also works. For batters, a little thyme plus a pinch of cumin and black pepper gets close.
Pairs well with¶
cumin, turmeric, chilli, ginger, garlic, asafoetida, coriander, amchur, chaat masala, chickpea flour, potatoes, lentils, fish, green beans.
Did you know¶
💡 Ajwain in fried food
Many Indian cooks add ajwain to heavy, fried or bean-based dishes, following a long tradition that it aids digestion. Whatever its effects, the flavour logic holds: a sharp, herbal note cuts through oil and starch in the same way that thyme lifts a rich stew.
Common mistakes¶
- Using it like cumin. Recipes that call for a teaspoon of cumin do not mean a teaspoon of ajwain; the thymol will dominate everything. Start with a quarter of what you would use of cumin.
- Adding it raw at the end. Unlike chaat masala, ajwain needs heat or time in a dough to soften; sprinkled raw on a finished dish it tastes harsh.
- Confusing the names. Some shops label ajwain as "lovage seed" or "omum", and "bishop's weed" can mean other plants entirely. The seed you want is tiny, grey-brown and smells unmistakably of thyme when rubbed.