To make apple ocarina, you need a big apple. Choose apple which easily to cut just using cutter. Look at the picture, this is structures of ocarina, number 1 for mouth, you can blow at number one, and number 4 for finger hole. But this is a structure of original ocarina, it's not a structure of apple ocarina. But you can make your apple having structure like that using your cutter.
|Ocarina Structures (images from wikipedia)|