Heat butter over medium heat in a large pot.Add the onion and cook for 2 minutes, stirring frequently. Add the garlic and cook for 1 minute. Add tomatoes, salt, pepper, Coriander leaves and 50ml water. Bring to a boil, then reduce to a simmer.

Cook on medium heat for 20 minutes, until the tomatoes are tender and cooker. Using a blender, remove bay leaf and blend until smooth. Now sieve it properly.

After sieve,add 250 ml water,salt,cream and simmer for 7-8 minutes on low flame.