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Cover the raspberries with sugar and let sit for 3-5 hours or overnight. If the berries are juicy and overripe, 2-3 hours is enough.
Bring to a boil, skim, turn off and let cool.
Repeat the process three times, gradually adding sugar.
Pour the boiling jam into sterilized jars and seal tightly.
This method allows you to preserve raspberries in excellent condition without additional sterilization. The jam turns out thick and aromatic, and does not “swell” or spoil.