Cake

Cake is a food that players can make at level 40 Cooking which yields 180 experience. Cake heals 4 hitpoints per bite. The cake is consumed in 3 bites, making a total of 12 hitpoints recovered. This makes cakes really useful for low-leveled players as it can be easy to obtain from Thieving or Agility. it can be bought from the Salesmen for 50gp

Thieving
With level 5 Thieving, cakes can be stolen from Ardougne and Keldagrim. However, after stealing from a stall you cannot interact with the salesmen, and they call the nearby guards if you attempt to.