Blackberries jam

Mix blackberries and sugar in a thick-bottomed pan. Add lemon juice and sugar and stir over medium heat till the sugar is dissolved. Bring to a boil, reduce heat and let the mixture reduce over medium heat about 15-20 minutes to a jelly. (A drop jelly on a plate must get jelly-like when cold.)

Remove the jam from the heat and wait 2 minutes so the bubbles can dissapear.

Pour the hot mixture (optional strain) in hot, sterilised jars and close immediately. Put the jars upside down to cool.

Label cooled jars with contents and date and store at a cold, dark place.

Keep the jam in the fridge after opening.