Take the smallest size of chickpeas. Bigger ones would fill the space in just one or two kernels only.
Scooping is best done with Peeler.
Take care that the bottom remains intact. Otherwise all filling would drop.
Scooped out potatoes can be used for stuffed chapatis/cutlets/Papdi Chaat etc.
Scooped out cucumber/bananas can be eaten raw.
Scooped out watermelon can be eaten raw or for making juice.
Sprinkling masala in the hollowed fruits is very important as this does not give bland taste when kulia is eaten. It acts like marinating the vegetables in spices.