Quarter the melon, cut the flesh from the skin and chop finely. The pulp should make about 1250 g. Put the pulp into a large pot, cover and simmer for about 25 minutes at medium heat.
Wash mint, dab dry, chop coarsely. Sort the raspberries. After 15 minutes cooking time add mint and raspberries and let it boil along. Line a sieve with a gauze cloth. Add the fruit and collect the juice.
Leave to drain for about 30 minutes. Measure 600 ml juice, mix with vodka, lime juice and jam sugar in a large pot. Stir constantly and bring to the boil over high heat. Cook for at least 4 minutes while stirring until bubbly.
Fill jelly into prepared jars and close.