She insisted that the used lemon was a tasty treat last night. I decided to teach her a lesson and gave her the remains of half a lemon. First she tasted it. Then she barked at it. This little dance was repeated several times throughout the night. This morning she gnawed on it a little more, barked at it a little more, then learned how to lick the fruit out of the pith shell.
Weirdest dog ever.