To grill your nectarines:

1. Heat grill to medium-high heat, and lightly spray with cooking spray.
2. Using a sharp knife, slice your nectarines in half, then carefully separate the halves.
3. Remove the pit, and the cut both halves into thin slices.
4. Once grill is heated, place nectarine slices directly onto the grill.
5. Cook for about 1 minute on one side, then flip and allow other side to cook for another 1 minute.
6. Carefully remove grilled fruit from the grill and onto a plate.

To serve

1. Arrange grilled peaches, burrata, prosciutto slices, and basil leaves on a large plate, serving tray, or cheese board, along with plenty of toasted sliced bread. OR
2. Serve each crostini pre-assembled: bread -> prosciutto -> burrata -> grilled nectarine slice -> basil.