Boil pumpkin in reasonable amount of water as it will be needed to blend the pumpkin and pineapple. Once cooked, let both water and pumpkin cool.

In a blender, add pineapple, pumpkin (with water) and ginger; blend on high speed until everything is well blended together. Add sugar and stir well until sugar is dissolved. Test for taste and if not sweet enough, add sugar to your desired sweetness along with lime juice.

Strain juice through a fine-mesh sieve. Serve immediately.