Raw bacon is a guaranteed drop from Pigs found in the cellar (northwest side of building) of the Falador farm, where players may find Eli Bacon. One piece of bacon can be cooked on a fire or range to make bacon requiring 14 Cooking and giving 68 experience. The quest Bringing Home the Bacon must be completed to obtain bacon from pigs or to cook it.
As the player's cooking level increases, they can use pieces of raw bacon on other pieces in their inventory to create larger piles of bacon that can be cooked together to heal more per inventory slot. Cooked bacon cannot be used for this purpose. This is also useful for players farming pig teeth as they can free up inventory space without dropping items.
Additionally, four pieces of raw bacon can be used to brew pigswill. The cooked version is the main ingredient of pork pie.
For an exhaustive list of all known sources for this item, see here
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