If using fresh: slice up the mangoes so that you get as much meat out of them as possible, then discard the pit and peels.
If using fresh: slice the passion fruits in half and scoop out the seeds.
Add the fruit, juices, ground-up freeze-dried pineapple (if using) and sugar to a medium sauce pan and bring to a boil.
Reduce heat to medium-high heat and let bubble, but cover partially with a lid. Keep and eye on this so it doesn't overheat and bubble over the side.
After about a good 10 minutes, reduce the heat to medium-low, keeping it partially covered ang bubbling lightly for 1-2 hours. (Depending on the water content in the fresh or frozen fruit).
Once the fruit has been boiled down, but not quite completelly you can turn the heat off and let cool for a good 15 minutes before serving or storing.