Pressure cook the chicken offals with salt and pepper for one whistle. Do not add any water. Alternately, cook in a pot of boiling water seasoned with salt and pepper till 3/4ths done.
In another pan, heat coconut oil, add crushed garlic and curry leaves. Saute for a minute and add both types of chilli powder.
Transfer the cooked chicken offals along with half of the stock and cook on high flame for 2-3 minutes. Then reduce heat and cook till the gravy has reduced and just about coats the offals.
Garnish with coriander leaves.
Notes
Adjust the chilli powder quantities to suit individual heat preferences.