Rock cake

A Rock cake is something of an ogre delicacy and is quite literally a cake made out of rock. Rock cakes can be obtained by stealing from the market stall in the ogre town of Gu'Tanoth, granting 6.5 Thieving experience, you will need a thieving level of 15 to steal the cake. A rock cake is required as a bribe in order to access the central parts of the Gu'Tanoth, which is necessary during the Watchtower quest. The player must give a rock cake to a guard in order to be allowed to climb over a rampart that blocks the way to a rope bridge.

According to Easta Buni, rock cakes are a "speshul Easta fud."

Trivia

 * The rock cake is a play on the real world rock cake, which is a small cake with a rough surface containing raisins and currants.
 * It deals 40 life points of damage if eaten, the damage isn't dealt until after you click to continue when your character says: "Ow! I nearly broke a tooth!". the 40 lp damage is still dealt even if you log out before clicking continue.