There are hundreds of chutneys that I make, mainly to pair with the main dish cooked for breakfast. One of my favourites is onion chutney. It has a combination of sweetness, sourness and spiciness that makes it a great combo with bland dishes like idli and dosa. Each of these chutneys have several variations. It is only your imagination that limits you. Given below is one version of the classic onion chutney. Do experiment using different combinations of spices and condiments.

Ingredients
250 gms onions
2 dried red chillies (adjust according to taste)
A small ball of tamarind (soaked in water)
1 tsp date paste (optional)
Salt to taste
2 tbsp grated coconut
1/2 tbsp roasted split black gram (urad dal, ulatham parupu)
A pinch of turmeric powder
A pinch of asafoetida
1/2 tsp mustard seeds
1 sprig curry leaves
Method
Peel and dice the onions
Set aside
Grind red chillies, salt, date paste, coconut, tamarind and roasted gram (add very little water if necessary)
Add the onions and grind coarsely
Set aside
Heat a wok and add mustard seeds
When they start spluttering, add curry leaves, asafoetida and the ground paste
Cook for a few minutes (add a little water if too thick)
Remove from flame
Serve with idli, dosa or anything else that takes your fancy
Enjoy!