Firstly, in a pan heat 2 tbsp oil and roast 2 tbsp urad dal till turns aromatic.
Add 1 inch of ginger, 3 cloves of garlic, and 10 dried red chilies. Roast until the chilies puff up.
Further saute ½ onion, till the onion softens and raw smell is lost.
Add 3 tomato, ¼ tsp turmeric, and cook until the tomato softens and turns mushy.
Cool completely, and transfer to the mixer jar.
Add 1 tsp salt and grind to a smooth paste adding water as required.
Transfer the chutney to the large bowl and adjust the consistency by adding water as required.
To prepare the tempering, heat 2 tbsp oil. Add ½ tsp urad dal, 1 tsp mustard, 2 dried red chillies, a pinch of hing, and a few curry leaves.
Splutter the tempering and pour over the chutney.
Finally, enjoy Tomato Onion Chutney Recipe with dosa, idli, and rice.