Chopped onion is much more useful after it has been cooked to make fried onions, which heal 840 life points. Members can make these by using the chopped onion on a range or fire. This requires level 42 Cooking, and gives 60 experience points. More commonly, they are combined with fried mushrooms to create mushroom and onion at Cooking level 57, which does not grant any cooking experience but does produce one of the two final ingredients required to make the more desirable mushroom potato. It is also needed in a part of expanding the Thieving Guild, to make the Vial of stench.