Blackberry jam

Remove the stalk to more warm soapy water and rinse thoroughly.

Put them in a pot of steel together with the lemon juice and sugar, stir with wooden spoon and keep the flame low.

Cook for about an hour, skimming if necessary.

When the density is just blank and pour immediately.

Note: you must use healthy fruit and fair point of ripeness, not wash it too often in water and wiping with a clean cloth; for cooking pots are preferred by high steel as this is slow and very long; for glass containers have the utmost care and cleaning and must be airtight; Finally, if the jam is mildew on the surface removed that part, clean the jar and cover with alcohol for liquor at 90 degrees.