I use roasted peanuts, dry red chillies, garlic, onions, little jaggery and tamrind pulp to make the peanut chutney. U can also add some curry leaves while grinding.
Here is how I do Groundnut Chutney. We need to first roast the peanuts. Roasting peanuts makes them crisp and brings out the flavor by activating their essential oils. You need to roast the peanuts on a very low flame. Heat a pan with a cup and a half of peanuts and dry roast them until the skin is dark and the aroma is nutty. It will take a good 10 minutes. Roasting on a low flame is important else the nuts might burn on the outside. So take it low and slow. Good things take time. Once roasted, just smash the peanuts with a cup so its easier to de-skin. You can omit this step if you want to keep the skin on for your chutney. But I like it without the skins. Heat oil in a pan and add in 2-3 cloves of garlic. I added more as my garlic cloves were unbelievably small. Add in the dried red chillies and onions, saute on medium flame for 3-4 minutes until soft. No need to brown. Add in the salt, tamarind and the jaggery. There is an untold rule. Wherever tamarind goes, jaggery also goes. That little addition of jaggery rounds out the flavor and makes it very delicious. Briefly saute for a few seconds and remove off heat. Grind this mixture along with the peanuts to a smooth paste. Add upto 1 cup of water while grinding. You can serve as is or do a simple tadka/tempering the following way. Heat oil in a pan and add couple of dried red chillies and a sprig of curry leaves. When the curry leaves turn crisp (usually 30-40 seconds in medium flame), remove off heat and add it to the Groundnut Chutney.