Heat the oil and saute some coriander stalks and chopped garlic till its golden.
Next add chopped onions and saute too for a minute.
Now de seed the pepper and chop and add with onions and cook on slow heat for 2-3 mins.
Add some jaggery and salt and keep cooking it till its tender.
Transfer it in a mixer and make a paste of this and then again back to the pan.
Add this moment add the ketchup , soya sauce and mix it well for another 2 mins and adjust the seasonings as per taste.
At the end add the vinegar and sesame seeds and mix well and cool it to store in an air tight jar.