Kalonji vs Onion Seeds: Are They the Same Thing?

Quick answer: No, kalonji and onion seeds are not the same thing. Kalonji is nigella seed from the Nigella sativa plant, while true onion seeds come from the onion plant and are mainly sold for growing onions, not for cooking.

The mix-up happens because kalonji looks a lot like onion seed and has a faint oniony smell, so many shops and recipes abroad label it "onion seeds". If a recipe for naan, achar or panch phoron asks for onion seeds, what it almost always means is kalonji.

Also known as: Kalonji is called nigella seeds or black seeds in English, mangrail or mangrela in Bihar and UP, kalo jeere in Bengali and karunjeeragam in Tamil. Onion seed is pyaz ke beej in Hindi.

Why Is Kalonji Called Onion Seeds?

There are two simple reasons. First, the two seeds look alike: both are small, black and slightly angular. Second, kalonji has a mild onion-like note when you crush it, which is why it suits breads and pickles. Over time, spice sellers in the UK and other countries started selling kalonji as "onion seeds", and the name stuck in many cookbooks.

Botanically, though, they are unrelated. Nigella belongs to the buttercup family, while onion belongs to the onion and garlic family. Different plants, different seeds, different jobs in the kitchen.

Kalonji vs Onion Seeds: What Is the Difference?

This is a rough home guide based on how the seeds are commonly sold and used in India.

Is Kalonji the Same as Black Cumin or Black Sesame?

This is the second big confusion. Kalonji is sometimes called "black cumin" in English, but in Indian kitchens black cumin usually means shahi jeera, which is long, thin and curved like regular jeera, with a sweeter aroma. Kalonji is shorter, more angular and much more pungent. We explain this in detail in Kalonji vs Shahi Jeera.

Black sesame (kala til) is also different. Sesame seeds are flat, oval and oily, and taste mild and nutty rather than sharp.

How Do You Use Kalonji in Indian Cooking?

Whenever a recipe says "onion seeds", reach for kalonji. A little goes a long way:

• Breads: press a pinch onto naan, kulcha or mathri before baking or frying.
• Achar: add to mango, mixed vegetable or lemon pickle for that classic sharp crunch.
• Tadka: splutter in hot oil for aloo sabzi, pumpkin or dal.
• Panch phoron: kalonji is one of the five whole seeds in Bengali panchforan, along with jeera, rai, methi and saunf.
• Snacks: mix into the batter for besan pakora or kneaded dough for paratha.

For more ideas, read Mangrail in English: How to Use Kalonji.

How to Buy the Right Seeds

If the pack says "onion seeds" but sits on a spice shelf, check the look and smell. Real kalonji is evenly black with no grey dust, and when you crush a few seeds between your fingers you should get a clear peppery aroma. Seeds meant for sowing are sold in seed shops and may be treated, so never cook with seeds bought for gardening.

At ODM Masala, our kalonji (nigella seeds) are whole and cleaned, free from dust and impurities. Like all our spices, they are handpicked, with no artificial colours, fillers or preservatives. Store them in an airtight jar away from heat and moisture so they keep their aroma.

FAQ

What is kalonji called in English?

Kalonji is called nigella seeds or black seeds in English. It is often wrongly sold as onion seeds, and sometimes as black cumin.

Can I use onion seeds instead of kalonji?

If the "onion seeds" are from a spice shop, they are almost certainly kalonji, so yes. True onion seeds sold for gardening are not meant for cooking and will not give the same flavour.

Does kalonji taste like onion?

Only slightly. Kalonji is mainly peppery, a little bitter and nutty, with a light onion note that comes through in breads and pickles.

Next time a recipe asks for onion seeds, try our ODM Kalonji for clean, aromatic seeds that lift your naan and achar.