Raspberries iterate,add half the norm of sugar,leave it until it let the juice. The juice is then carefully pour in a bowl(it should be with wide margins) in which you cook the jam portions to put in it the rest of the sugar,stirring bring the syrup to a boil,cook for 5 minutes, skimming often. Then portions dipped in syrup raspberries, stir a little,cook on medium heat for 20-30 minutes,no more,otherwise the jam will lose color and flavor.(5 minutes until cooked add the citric acid).Do not forget often to remove the foam during cooking to Spread the jam in clean sterile jars,immediately roll boiled caps,flip the jars for 1 hour upside down to samostimulyatsii. Then invert the jars and cover with a cloth leave it to cool.