Peel the green outer skin of the watermelon rind using a peeler.

Cut the watermelon rind into small pieces using a knife and cutting board.

In a pot, bring 1 liter of water to a boil on the stove.

Add 3 tbsp of sugar, 1 tbsp of salt, and 2 tbsp of 9% vinegar to the boiling water and stir until dissolved.

Add the watermelon rind pieces, dill, celery leaves, mixed peppercorns, cinnamon blossoms, and optional chili to the pot.

Simmer for 10 minutes until the rind is tender.

Transfer the mixture to a jar and let it cool before sealing.