Instructions:
Cut the watermelon into chunks, removing the seeds and rind.
Place the watermelon chunks in a blender or food processor and blend until smooth.
Pour the pureed watermelon into a large pot or saucepan and bring it to a boil over medium-high heat.
Once boiling, reduce the heat to low and let the watermelon simmer for about 1-2 hours, stirring occasionally, until it has thickened to a jam-like consistency.
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