Wash and clean the berries.
Place the berries on a piece of cloth, like a towel and let them dry completely.
Pout a layer of berries and a layer of sugar in a pot
Cover the pot with a lid
Place the pot in the fridge for 24 hours.
Then, put the pot on high heat, until the water inside the pot starts boiling.
Collect the foam on the pot regularly and take it out
After it boiled, turn down the heat and cook the jam on low heat for 30 minutes.
Add vanilla
If there is extra juice left, you could use it as syrup.
Pour the jam in proper jogs with lids and keep in the refrigerator.
For longer and better maintenance, keep it in the freezer.