Kernalfruit is a fruit mentioned on page 398 (paperback) of Lodestar. Keefe was complaining to Sophie in  

their Telepathic conversation when Keefe was a member of the Neverseen. It is said to taste like banshee poop, and is described as a "shriveled green fruit in his mind, and it looked like a cross between a pomegranate and an ear of corn--which wouldn't of been that bad, if the grains of fruit hadn't been coated in a black powder that looked way to much like mold." Keefe said that was the result of the Neverseen angering the gnomes. He even asked Sophie to grab a snack and then describe it just because the Kernalfruit tasted so bad. 

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