- Slit on bottom of tomatoes. furthermore, add 6 tomatoes into boiling water and blanch. close the vessel and boil for 3-4 minutes. further, peel the skin of tomatoes once they cooled completely. then take 3 peeled tomatoes and blend to smooth purees. chop other 3 tomatoes discarding the seeds. transfer to the plate and keep aside. furthermore, heat oil in a non stick tawa. add chopped garlic and saute till they turn slightly golden brown. further, saute chopped onions till they change colour. then add chopped - deseeded tomatoes and cook completely. mash in between so that it turns mushy soon. also add prepared tomato puree. mix well and add basil, sugar, chilli powder, oregano, chilli flakes and salt. mix well and get the sauce to a boil. further, cover and simmer the sauce for atleast 5 minutes. also add tomato sauce and butter. Mix everything and store.