Mix the small diced fruits with sugar and boil in a saucepan only briefly, remove from the heat and let simmer covered for about 5-10 minutes.
Puree thickly in a blender and fill into small glasses with screw caps. Allow to cool and store in the refrigerator. Lasts 3-4 weeks without additives.
If necessary, you can add some apple gelling agent, with lemon, orange, apple and possibly a dash of cognac there are good tastes.
Pay attention to small amounts, because jams are carbohydrate carriers that you should reduce.