Cut off the points on each side of the lemon without penetrating the flesh of the fruit; just enough to make a flat end that the lemon can stand on. Cut lemon in half across the belly.
Carefully run a knife around the interior of the lemon to loosen the flesh and scoop out the contents and place into a bowl.
Repeat steps 1 and 2 with all lemons.
Set the empty lemon shells aside and place the lemon flesh and juice into a blender. Add banana, honey and ice into the blender.
Blend until the texture is smooth.
Add the mixture into each of the lemon shell “cauldrons.”
Place the cauldrons onto a pan and place in the freezer for 1 hour.
Remove the cauldrons from the freezer when the mixture has a slushy texture and serve. Cauldrons can also be served immediately without freezing if desired.