Cook the tomatoes, onion, garlic and ginger till the tomatoes are mushy. Cool completely.
Grind the tomato paste in the blender and then strain it through a soup strainer.
Add the tomato paste, sugar, salt, spice powder,red chilli powder.
Cook till the mixture thicken add the vinegar. (Be careful as the mixture will spurt.)
The sauce is done when the mixture boils in the centre.
Remove from the heat and add soduim benzoate mixed in water (if using).
Place the sterilised and dried bottles on a wooden board and add the sauce in the bottles. Let the sauce cool on the wooden board else the bottles will crack.