Material that we should prepare are half kilo fresh blackberry and 2 glass of sugar (If your blackberry taste so sour you may add some more sugar as your optional)
How to make is easy:
Wash your blackberry and drain. Put on sauce pan with the sugar. Cook with low to medium heat until sugar melted and berry soft enough. Do not stir it too much as it will make your berry crush. Cool it on room temperature then ready to use or you can keep it inside clean and dry jam jar.