Raspberry and rhubarb jam

The raspberries are ripening on the allotment so the first batch I picked was combined with rhubarb to make a rather tasty jam. Equal quantities of raspberries and rhubarb were used and lemon juice provided the pectin. Boil them up together until they have pulped and then add sugar (same weight as overall raspberries and rhubarb) and bring to setting point.