1Cook the pasta in a large pot of boiling salted water until al dente. Drain and set aside.
Heat the oil in a pan over medium heat. Add the mustard seeds and let them splutter.
Add the chopped onion and sauté until translucent.
Add the chopped green chillies and sauté for another minute.
Add the chopped tomatoes and cook until they soften.
Stir in the ketchup and cook for 2-3 minutes.
Add the cooked pasta to the sauce and mix well to coat the pasta evenly.
Season with salt to taste.
Garnish with coriander leaves and serve hot.