Cut the melon flesh from the skin. Weigh 400 g and cut into small pieces. Select raspberries. Wash lime, grate dry and thinly grate the skin. Halve lime and squeeze.
Puree lime juice, melon pieces and raspberries and pass through a sieve. Put fruit puree and jam sugar in a pot and boil for about 4 minutes until bubbly. Wash the mint, shake dry and cut the leaves into thin strips.
After about 3 minutes, add mint and lime zest. Fill jam immediately into clean jars, close them tightly and place them on the lid for about 10 minutes.