Steps
1. Heat the mustard oil in a pan on medium heat.
2. Add cumin, mustard, and onions. Let it saute for around 1 minute or until onions are lightly browned.
3. Add shrimp and cook until it has cooked through.
4. Add crushed tomatoes and let it simmer for around 4 minutes.
5. Add coriander and salt, and let it cook for 1 minute.
6. Serve hot.