In a saucepan, add oil and add the garlic, ginger, green chili.
Saute in a medium flame for a minute and add sugar to it.
Saute it till the sugar turns light brown(this will give a nice taste)
Now add the capsicum and saute for a few minutes. Ensure that it should not overcooked.
Now mix the water with all-purpose flour and pour it into the saucepan.
check for salt and boil on a low flame till the sauce slightly thickens. Add Soya sauce to this now.
Add tomato ketchup (if adding)at this stage and mix well.
Add the balls before serving.