Slice the pumpkin and carrot into slices and place in a saucepan. Add 300–400 ml of water and sugar and mix well.
Cook under a lid over medium heat until the ingredients are soft, and after a blender, turn them into puree.
Pour the remaining water into the puree and mix thoroughly. Pour in citric acid and bring the juice to a boil. Boil, stirring, for another 5 minutes.
