Cut the melon into cubes.

Place it in the pot with the sugar and boil over strong heat.

Take care so that it doesn't stick, stirring it from time to time with a wooden spoon.

An hour later or when the jam starts to set, turn down the heat so that it doesn't burn and stir more often.

Add the lemon juice.

Do the trick with the plate and when it is ready, add the vanilla.

Ready!