Well onions increased the flavour of sweet and savory of any dishes, and also onions contains medicinal purposes for antiviral, antibacterial, fungicidal and anti-asthma since ancient times... Are you allergic to raw onions or cooked onions becoz I have a friend who allergic to raw onions but not on cooked onions becoz the proteins that causes allergies contains in raw onions disappear when it cooked... BTW I allergic to any Soy product in liquid form ( Soy Milk ) but not on dry soy product like dried tofu becoz the drying process removed the proteins that causes allergic reaction to my skin and I puke dozen of times if drinking in liquid form becoz the proteins in it is concentrated...