Scoop watermelon out of shell. Do not discard it
Blend watermelon into juice
Strain the juice. You can add little lemon juice for a tangy flavour or skip it
Warm the juice with sugar until sugar dissolves completely. Adjust sugar depending on sweetness of watermelon
Sprinkle gelatin over cold water. Rest for 5-10 minutes until spongy. Dissolve Gelatin over low heat or microwave. Stir until it dissolve completely. Add to watermelon juice and mix well
Pour the juice in the shell and let it rest until jelly is set preferably overnight
Trim the top layer of watermelon to evenly layer the jelly
Slice and serve
