Touch the bomb-changer, enter the teleporter, and throw a green bomb into the nearest group of lemons from the ledge. Drop down and plant a white bomb next to the leftmost surviving lemon, so that it goes off just as they're all unfreezing. It will slam all the rest, leaving you with only one fruit to manage.
I still haven't figured out how to solve the "not perfectly centered" problem, but that should at least reduce the lemon-related hazards.

Unrelatedly, what does the "G" in the Hell level numbers stand for? (54.12.1G.etc.)
