This recipe is based on several youtube videos I referred to, there isn't a particular source. This style of gongura pachchadi is apparently followed in the Guntur region of Andhra. Another simple style is to skip the whole coriander, cumin and methi.
Optionally, garlic can be added. Depending on your preference, add it fresh or saute with the spices.
The preferred chilies are the round type for the chutney. For tempering, long red chilies are used. Of course, if all you have is long red chilies, go ahead. You won't be sued, just don't tell any andhra person.
Gongura chutney in the making