Wash the Roselle Calyx (200 gram) till clean. Tear into small size. Blend roselle together with Water (1/2 cup) till fine in two batches.
Pour the blended roselle into pot. Add in Granulated Sugar (1 1/2 cup) and cook at medium low heat, stir till mixture combined.
Mixture starts boiling, small bubbles seen in 3-4 minutes. Stirring occasionally until mixture thickened.
Check by drawing a line in the center. The line can stay for a few seconds before disappear. Takes to cook for about 20-25 minutes.
Pour jam into clean jar and allow to cool before putting it in the fridge. The jam will thickens further after chilled. Serve and enjoy!