
Prepare the strawberries. Place the berries in a deep bowl. Mash them until smooth. Place the mashed strawberries in a saucepan (not metal).

Cook the first batch. Pour all the sugar into the strawberry puree. Bring to a boil, constantly stirring the strawberry-sugar mixture. When it boils, reduce the heat to medium and cook for another 5 minutes. Remove from heat, cover with a napkin and leave in a cool place for 8 hours.

Finish the cooking process. After 8 hours, put the almost ready jam back on the fire. Bring to a boil. Reduce heat to minimum and cook for 5 minutes. Don't forget to stir constantly. Remove from heat, set aside to cool.

Preserve the jam. Pour the jam into sterilized jars, roll up the lids. Let the jars cool completely, then put them in a cool place.