Place tomatoes and coconut in the bowl of a food processor. Allow to cool down slightly. Grind to a coarse paste. Set aside.
Meanwhile, heat oil in a pan over medium-high heat. Add mustard seeds and allow to splutter. Add curry leaves. Add onions, and sauté for 2-3 minutes or until they turn golden brown. Add garlic, and sauté for 2 minutes or until aromatic.
Stir in turmeric and red chili powder. Saute for a minute. Add tomato paste. Season with salt. Pour in a little water if needed. Bring to the boil. Simmer for 3-4 minutes.
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Notes
- If you want to use fresh tomatoes, chop them and add to the pan along with the onions. Then allow the mixture to cool down, and grind to a coarse paste.