Pour the raspberries into a saucepan. Fill with water and place on the fire. Bring to a boil and cook for 10 minutes. Remove from the fire.
When the boiled berries have cooled, pour the mixture into a bowl covered with a double layer of gauze. Connect the edges of the gauze, squeeze out the berry mass. All the grains will remain in the fabric, and the bowl will be filled with thick raspberry juice.
Add sugar to the raspberry juice. Put the syrup on medium heat and cook for 20 minutes. Remove the container from the heat, pour in the gelatin in a thin stream, stirring continuously.
Preserve the jelly. Pour the hot raspberry jelly into a sterilized jar and screw on a sterilized lid. Cover with a towel and let cool at room temperature for 2-3 hours. Then put it in the refrigerator or a cold place.