For best flavor, use a very ripe but still firm melon so the pieces don’t collapse on the skewers, and let the melon and mozzarella come slightly toward room temperature before serving to enhance sweetness and creaminess. Wrap or fold the prosciutto loosely so it looks generous and doesn’t chew too densely in one bite, and avoid over-salting since prosciutto is already salty. If making ahead, assemble the skewers and add oil, balsamic, and salt just before serving to keep the basil vibrant and the prosciutto from turning too soft; you can also vary the flavor by swapping basil for mint or adding a small cube of cucumber or a grape tomato to each skewer.