Clean the rhubarb and cut into cubes, mix with 500g preserving sugar and let stand until the rhubarb has drawn juice. Mix the raspberries with 1 kg of preserving sugar. Now combine the rhubarb and raspberries, add lemon juice and cook according to the jam sugar instructions, skim and add the vanilla sugar. Now fill the prepared twist-off glasses. I got 17 jars of 230 ml each.