For 6 people
Boil the mangoes in a large saucepan filled with water for 20 minutes.
After this time, remove and drain the mangoes and let them cool. Then peel them and remove the pulp.
Place the pulp in a saucepan without water and add the sugar, lemon juice, and gelatin. Then cook everything for 12 minutes, stirring.
Pour the jelly into glass jars and let it cool.
Serve.