Wash your tomatoes and cut them into pieces.
In a bowl, combine tomatoes with sugar, lemon juice and cinnamon. Strain and store in the refrigerator for at least 12 hours.
Heat your mixture and when the sugar is completely dissolved, cook over high heat for 10 minutes, stirring regularly. Skim off the foam.Put everything in a blender and blend finely. Lower the heat and continue cooking for 25 minutes, stirring regularly.
Then pour your jam into sterilized jars and turn them over until they are cold.