Begin the quest by speaking to Timfraku upstairs in the house west of Trufitus in Tai Bwo Wannai. He will tell you how the village hasn't fully recovered yet, and asks if you could find his three sons, Tamayu, Tinsay, and Tiadeche, and convince them to return to the village. Monkeys can be found wandering the jungle. Kill one, pick up its corpse, then move on to "Fishing for Karambwan". Do NOT attempt to make the sandwich yet. Doing so results in a "stuffed monkey", which Tinsay does not want. You cannot make the sandwich without monkey skin, which can be made by Tiadeche after you help him.