What's a good substitute for onion for someone with an onion allergy? I am an allium lover with a strong allergy to all alliums. It is technically a sensitivity, as it isn't an instant reaction, but spending an hour in the bathroom because of one stray piece of red onion warrants a scarier word then "sensitivity". For those not familiar with plant taxonomy, alliums are the plant family that holds garlic, onions, chives, and leeks.

My allergy is progressively getting stronger and I can no longer lie to myself. I need a good substitute for that fantastic allium taste. Right now I can still eat garlic in reasonable amounts (thank god), but red onions are out, and everything else from white onions to leeks is somewhere in between. Any and all preparations of allium trigger the allergy, so no onion powder.

I am desperately looking for a non-allium onion substitute. My hope and dream is something that tastes like onion but isn't an allium. I would accept any strongly flavoured class of plants to switch addictions to.
The perfect solution to you - Use the Indian spice called "Asafoetida" or "Hing". It gives a taste which is very much like Onion and Garlic - In fact, stricter practitioners of Hinduism are not allowed to eat onion and garlic (as supposedly they cause mental agitation). Thus, traditional Hindu (Vedic) cooking uses Asafoetida as a subsitute for onion in Indian recipes which almost invariably call for the use of onions.

The spice gives off a slightly funky smell (I like it, but most people describe it as bad), but tastes great. It is easily available in powdered form in Indian grocery stores - and usually comes in small containters such as this:



It has a VERY strong taste, so put a very small amount of it - about a 1/4 of a teaspoon for a dish that's meant or 4 people. Usually in Indian cooking it is quickly fried to get rid of the "raw" taste. I am not sure how well it tastes in salads, you'd have to experiment with it.