So after searching for a natural sweetener based jam and failing to find one I have made my own.
I am lucky or unlucky enough, depending on your point of view to have blackberry bushes on my fences so I took the opportunity to pick a 1 kg/2.2 lbs to make jam.
Make sure you have clean jars ready to go.
1kg/2.2lbs of blackberries
Juice of 1 lemon
12 sheets of gelatine
3/4 cup of erythritol (it acts as a preservative like sugar)
Wash berries and remove any stems
Put berries, lemon juice and sweetener into a large saucepan with 150ml of water.
Bring to boil.
Place gelatine sheets in cold water for 3-5 minutes. Then drain water and squeeze.
Add gelatine to berries and simmer for 5-7 minutes.
Pour into jars. Seal jars and place in fridge to set. Store in fridge.