1: Heat water in a pan, add salt and bring it to a boil.
2: Add the pasta and boil it according to the instructions on the packet.
3: Strain it and keep it aside.
4: In a mixer grinder, puree 3 tomatoes and keep it aside.
5: In a pan, add butter and maida. Mix till they combine and turn into a sandy texture.
6: Add milk and keep whisking till there are no lumps and the mixture starts to thicken. Keep it aside.
7: Heat a pan, add oil, add garlic and sauté for a few seconds.
8: Add the onions and sauté till it turns translucent.
9: Add the pureed tomatoes and cook till it is rid of its raw flavor.
10: Add the tomato mixture to the white sauce, mix till they combine.
11: Season the sauce, add the cooked pasta and mix till it is coated with the sauce.
12: Add grated cheese and mix well.
13: Garnish with oregano and serve hot.