While examining one of the prisoners' suicide notes, L discovered part of a message:
L do you know…
He racked his brain hoping that Kira, who he was sure was responsible, would not leave him there.
A second note was found…
Finally! The end to L's puzzling.
…Shinigami love apples.
"What?" L found this impossible to believe. "I hate apples!" Unless they're caramelled...
"Not to offend, Ryuzaki," Watari stated. "But I feel I should point out you hate all fruit."
"Not if it's candy covered." L muttered to no one but himself.
