Whisk tomato paste and 2 1/2 cups of water to form a smooth liquid. Heat unsalted butter or ghee in a pot and add cumin seeds. Once the seeds start popping, add the tomato mixture.
Add salt, sugar, red chile powder and ginger. Let boil. Meanwhile mix coconut milk and 1/2 cup water in a bowl and pour into the tomato mix. Allow the tomato soup to boil and top off with chopped cilantro. Enjoy this soup on a cold, wintry day or combine with a vegetable pilaf for a light, Sunday dinner.