Clean pumpkin and deseed. Cut to wedges and steam pumpkin with skin on for about 15 minutes or till pumpkin becomes soft.
Remove pumpkin flesh from skin with a spoon. Blend pumpkin (net weight about 250g) to smooth.
Combine blended pumpkin, yakult, lemon juice and sugar together in a pot. Stir well and bring to boil. Lower heat and keep stirring the pumpkin mixture for about 20-25 minutes until thickened.
Pour jam into clean jar and allow to cool completely before putting it in the fridge.
Notes
Recipe by Anncoo Journal at https://www.anncoojournal.com/pumpkin-yakult-jam/