Onion is an integral ingredient in cooking, as it is one of those ingredients that give food flavor and aroma. Among other things, onions contain significant amounts of a flavonoid called quercetin, which is thought to work against heart disease.
What many do not know is that depending on how the onion is cooked, there is a difference in the nutrients it offers.
In general, the cooking treatment of onion does not seem to significantly affect the levels of quercetin and other flavonoids it contains. Here are three things you need to know depending on how you cook it.