Wash the plums properly under clean water. Remove the seeds and cut them into small pieces. This helps them cook faster and evenly in the sauce.

Place chopped plums in a saucepan. Add water and sugar. Cook on medium heat. Stir gently until the plums become soft and start breaking down.

Once plums are soft, mash them using a spoon or blender. The texture should become smooth but slightly thick. This forms the base of the sauce.

Add lemon juice, salt, and chili flakes. Stir well to combine. These ingredients balance sweetness with a slight tangy and spicy flavor.

Chop fresh mint leaves and add them to the sauce. Stir gently so the mint flavor spreads evenly. This step gives a refreshing aroma and taste.

Cook the mixture on low heat for 5 more minutes. Stir occasionally to avoid sticking. The sauce will thicken and become glossy.

Remove from heat and let it cool completely. Pour into a clean glass jar. Store in the refrigerator for later use.