Wash and clean onions, tomatoes and garlic.
Cut onion and tomatoes into wedges and keep aside.
Take a wok/pan add butter once its clarified add garlic, onions sauté for a minute and then add tomatoes,½ teaspoon of salt so that it cooks fast.
Cook tomatoes till water is completely dried .Allow it to cool.
Once its cooled, take a blender add cooked tomato onion mixture , 1 teaspoon of mixed seasoning, paprika/chilli powder ,sugar, salt and tomato sauce (I use Maggi ,Hot and Sweet tomato sauce) blend to a smooth paste without adding water.
Adjust salt and seasoning if required.
Store it in a refrigerator and use it as required.