Mushroom & onion can be created by members with level 57 Cooking. Making mushroom and onion gives 120 Cooking experience and heals 110 life points when eaten.
To make mushroom and onion, obtain a knife, mushroom, onion, two bowls:
Use a mushroom with a bowl and cook it on a range to make Fried mushrooms.
Use an onion with another bowl and cook it on a range to make Fried onions.
Finally use one bowl on the other bowl.
Mushroom and onion may be added to a potato with butter to make mushroom potato.