Add asafoetida and curry leaves. Add red chilli powder, turmeric and coriander powder.
Stir 20 seconds. Reduce to low. Add whisked yogurt in 3 additions stirring continuously. Cook on low for 6 to 7 minutes until cooked through. Add 1/2 cup water. Bring to a simmer.
Add gatte pieces. Simmer on medium for 10 minutes — the gatte absorb the yogurt curry.
Add garam masala and salt. Garnish with coriander.