To start Gnome Restaurant, talk to Gianne Jr on the 1st2nd floor[?] of the Grand Tree. You will always want to do the hard orders. He will give you a delivery box and a name of a gnome to deliver food to.
Making the food
Gianne Jr will tell you whether the gnome wants crunchies, a batta, a gnomeball, or a cocktail. Click on the respective half-baked mould (obtained by using dough on the moulds, then baking) and hover over the product you need to deliver. Ingredients will be listed below, which can easily be bought from Hudo.
The only two ingredients that can not be bought (sliced and chunked fruit can be obtained by right clicking the specific fruit) are king worms and toad's legs. The quickest way to obtain these are from purchasing them from the Grand Exchange, but sometimes this can take a while. Perhaps the easiest method is to obtain the items yourself. Toad's legs can be obtained from picking up toads in the swamp area north-west of the Grand Tree and then picking off the legs. King worms can be obtained from the same area.
It is generally much faster to pre-cook a few of each of the food items in bulk, so you can withdraw the items from the bank instead of having to make a new one each time.
Delivering the food
It is possible to be asked to deliver a specific food to a gnome you can not access. For example, if you have not completed Troll Romance, you can not access Brambickle. You can cancel the order, but will have to wait five minutes to obtain another.
With access to all teleportation methods, it's possible to do more than 30 deliveries per hour. Unfortunately, some delivery targets are more common than others, with Ninto and Daerkin being far less likely to be chosen than other targets. Because of this, most of the money from this method will come from the rewards (herbs, uncut gemstones, runes) received from other targets.
Due to constantly changing prices on the Grand Exchange, some information in this article may or may not be current. It is strongly recommended to check the live prices on the Grand Exchange before making large investments in any method. All prices on this page are cached, meaning it is possible that they appear out of date. To force a new cache of this page, click this link. If a money making method is out of date, you can edit it or leave a message on the talk page.