In a saucepan, combine the chopped tomatoes, onion, garlic, and ginger. Cook over medium heat until the tomatoes are soft.

Add brown sugar, vinegar, salt, cumin, coriander, and chili powder. Stir well and let it simmer for 20 minutes.

Remove from heat and allow to cool slightly. Blend until smooth.

Transfer to a jar and refrigerate. Serve with your favorite dishes.