In a heavy-bottomed vessel, heat the sesame oil.
Add mustard seeds and wait till they sputter.
Include the 2-3 split red chillies, and fry for a couple of seconds.
Include the sesame-coconut paste, and tamarind paste. Mix well.
Include the cooked bachali koora and bottle gourd, together with some salt. Include water, if required, to guarantee the pulusu is of thick pouring consistency.
Mix well and let the Bachali Kura Pulusu boil for 5 minutes.
Serve with hot rice.