Heat oil in a pan. Throw in thenga kothu (coconut bites) and fry till they turn lightly golden. Remove from oil and keep aside.
Mix the crushed shallots and green chillies with ginger garlic paste, coriander powder, kashmiri chilli powder, turmeric powder, black pepper powder, garam masala, asafoetida, chilli flakes, vinegar and salt to form the marinade.
Add beef to the marinade and mix well. Leave to marinate for 15 mins.
Pressure cook the marinated beef for 6 whistles or till the beef is tender.
After all the steam has been released, remove the lid and cook till the gravy dries up.
In a separate pan, heat oil and add mustard seeds.
When the mustard seeds pop and splutter, add curry leaves and julienned onion.
Saute till the onion starts turning golden brown.
Then, add the cooked beef and fried coconut pieces. Saute till the colour of beef turns to dark brown. The more oil you add, the darker the shade of brown will be.