If using kiwi fruit, peel the fruits and slice each one into three thick slices, discarding (or eating!) the rounded ends.  Using a circle cutter of a slightly smaller size than your push pop container, cut the kiwi slices into circles to fit.

If using cucumber, slice into thick rounds and cut into circles as above.

Pop one kiwi or cucumber slice into the bottom of each push pop container.

Push the pop container through the watermelon slice to fill it with a round of melon (see photo below).  If your watermelon slice is too thin to fill the container, repeat until the push pop container is completely full of melon.

Pop the lid on, remove the stick if you can and pop into the freezer for a couple of hours or overnight until frozen solid.