A fruit in tropic lands

When you have a lot of time to think about random things, for example, while working on a rice farm, stuff like this happens. Enjoy(?)

There exists a fruit in tropical lands
Its purple shell will stain your hands

Plucked from the tree not the ground
With thick soft shell it's best found

Count the stem's leaves and you'll see
How many seeds there will be

Peel its shell to reveal a treasure
Inside are slices of pearl white pleasure

Once tasted it's of what you'll dream
Look for Mangosteen the fruit called queen