Wash melon, remove seeds, slice as shown below. No need to peel.

Put the melon slices into a bowl, add the brown sugar and mix well, cover with plastic wrap for 1 hour, let it absorb naturally.

Put the melon into a pot, add water and rock sugar, simmer over low heat for 1 hour.

Sift through a filter.

When you drink, mix it with water according to your favorite preference of sweetness.