Limes: Slice to about ⅓ in pieces.
Starfruit: Slice off the five outer edges and ends of each starfruit. The edges are tough and have very little flavor. You can slice the starfruit lengthwise, but if you're making these as gifts, Mom recommends cutting them across to retain their star shape. The core can also be dried and eaten. Cut each starfruit into 4 or 5 pieces depending on the size.
Pineapple: Most people (including myself) love the pineapple because it's like eating candy. So be sure to prepare extra. Cut off the skin and cut into a half-moon shape. You don't need to core the pineapple.
Banana: Apple bananas are my personal favorite, but regular bananas are great, too. Choose very firm bananas as soft bananas will just become mushy and impossible to dry.
Place each fruit in the food dehydrator. Dry as needed. This will be different for each machine and fruit, but you'll most likely have to leave the machine on for at least a day. The wetter the fruit, the longer you'll leave the dehydrator running.