Prepare the watermelon rinds by peeling the green outer skin first.

Then, cut it into 1-inch chunks and cut each piece into thin strips about 1 centimeter wide.

Place the watermelon rind strips in a bowl and add the white sugar.

Mix the watermelon rinds and sugar thoroughly until the sugar is evenly distributed.

Next, cover the bowl with a plastic wrap and place it in the fridge overnight.

Afterward, put the watermelon rinds in the cooking pot. Add a bit of water for boiling if needed.

Bring to a boil over high heat.

Once it boils, lower the heat to low and continuously stir.

Stir continuously while gently scraping the bottom of the pot.

Keep stirring until the sugars thicken.

Afterward, the sugar should become whiter and harder, coating the rinds with a frost-like layer.