First Hollow out the fruit of your choice.
I used lemons and oranges.
( My kids tried helping me with these but only Jackson my 7 yr. old was capable enough to accomplish the task)
Make your jello.
I used 8 oranges and 8 lemons and used 4 boxes of jello
Make sure they are pushed together enough that they are level when you pour in the jello.
Carefully put it in the fridge. It only took about 3 hours to set up and then I sliced them. Using a small serrated knife.