Black plum jam

Wash the plums and split in half.

Put them in the pot with the lemon juice and with bits of Peel.

Add sugar and cook on a low heat for 40 minutes.

Put in jars and cover of celophane.

Note some general rules about jams: take only healthy fruits for the preparation of jams; wash the fruit, remove the stones or the berries; counted 1000 g of sugar for every 1000 g fruit; don't compromise overcook at a time; take 1000 g for cooking: the sugar crystallizes and the jams will retain their beautiful color; Cook over medium heat until it forms a slight froth on the jam, then fill the jars; pour liquid paraffin on jam or stretch a cellophane paper pots; Let cool slowly the jam and keep it in a dry place with low light.