1. If the Mangosteen has a soft outer shell, simply squeeze the fruit between your two hands until the shell splits. Peel away the shell and enjoy the fruit.
2. If the Mangosteen has a hard outer shell, use a knife to gently cut around the mangosteen (as if you were cutting around a center seed). The incision should be one centimeter deep. Gently twist the two halves in opposite directions and peel them apart.