Rhubarb

The Rhubarb is a food and component added by Pam's HarvestCraft, which grows from a Rhubarb Seed.

Recipe
Other mods' Rhubarbs can be converted to the Pam's HarvestCraft Rhubarb if registered in the Ore Dictionary, as seen above. Rhubarbs can also be obtained from the Shaded Garden (or from the Ground Garden before version 1.8.9a).