Pumpkin cleaned of seed, peeled and grate or cut into shapes. Boiled in water for 2-3 in 10 minutes. The sugar and water is cooked sugar syrup. Add the boiled and drained of water pumpkin and boil to thicken the syrup. 2-3 minutes before removing from heat and add the tartaric acid dissolved in a little water and lemon juice. Finished jam packed into jars.