Plum jam! 1. Wash and dry your plums. 2. Take out their seeds. 3. Grind 2. 4. Pour 4 into a pot. 5. Add 30-40% sugar of your whole plum juice. 6. Simmer 5 until it boils. You should get rid of its bubbles on the surface. Otherwise, you might get a little bit rough jam. 7. Put Chinese gelatin(a sort of sea weeds) or gelatin in 6. 8. Before 7 chills down, pour it into small jam jars.