Raspberries and blueberries ripen at different times, so I just freeze them on the glass in plastic bags. Ripe raspberry - frosted glass. Came blueberry - again frosted glass. And plum is now on sale constantly, there is no problem. When all the ingredients are available, start making jam. The plums should be cut in half, remove seeds, then cut again in half and then crosswise into thin slices.

Put the plums in a bowl, sprinkle them with sugar, on low heat, stirring constantly, wait until the release the juice. Then add the fire, bring to boil again, turn down to low and on low heat cook for 30 minutes. Pour berries

Bring to a boil, reduce the heat and cook on low heat for another 30 minutes.

Ready jam pour into small jars and tighten lids. In the process of cooling the jam thickens. Believe me, it is wonderfully tasty.