Do laugh, this could be indeed a planting, a hint rather than a foreshadowing in this case. The hint being : Rabbit > Grilled.
This hint, and I'm sure Oda knows it, CAN be used as a reference to the myth of the jade rabbit/hare or Moon Rabbit where, in order to feed an old man, a rabbit will jump into the fire to be rosted and serve as a meal.
There are various version of this myth depending on the culture, here are two of them:
The chinese one:
The Japanese one:
So...
If Oda is indeed doing a reference to the moon rabbit, let's just say that this could not be a coincidence and this could be an hint planted to help the power of the thematic that may come later.