Peel and core the melon and cut into cubes. Soak in the Guyana rum and place in the refrigerator for one to two hours. Carefully lift occasionally.
In the meantime, cut the small red onion and the pepper into fine cubes and chop the coriander leaves. Dissolve the sugar in the lime juice and mix with the onions and pepper.
After the melon has absorbed the rum aroma and has cooled down nicely, fold the dressing under the melon pieces and season with salt and pepper.