Start with cutting tomatoes into circles. Put them in a bowl and add all the tomato rub ingredients. Mix everything well.
Now arrange the tomatoes on a baking sheet. Add whole garlic cloves. Roast the tomatoes at 350 F for 20 minutes.
Once done, take them out of the oven and let them rest at the room temperature for few minutes.
Now add the roasted tomatoes to the food processor. Add half of the basil leaves and make a puree. Keep it aside.
In a saucepan heat butter and add roasted cumin seeds. Add the remaining chopped basil leaves. Now add the tomato puree, (make sure the heat is on low). Let it simmer for a minute or so. Then add the tomato ketchup, sugar, and water. Add salt and freshly ground black pepper too.
Once the soup comes to a boil, add the heavy cream and cook for a minute. Then turn off the heat.
Pour soup into the serving bowl, garnish with cream and serve warm.