The urn is filled when the player has earned 5,250 Cooking xp with the urn in inventory. Once the strong cooking urn is full, it becomes a strong cooking urn (full) and can be teleported to Ernie for 1,050 Cooking experience. All cooking urns give you 20% more experience per cooked food item. A strong cooking urn is crafted from two pieces of soft clay. Use a pottery wheel and select "cooking urns" from the drop down menu. Then add a fire rune to finish the urn. Many different foods may be cooked. The following are only examples.