Some people call it kosthu/ gosthu and some call it kotsu/ gotsu; I’m used to kosthu but I've no idea of the etymology. Tomato kosthu is a tangy saucy side dish that goes well with idly/ dosa or with pongal. I had eaten this first prepared by one of my roomies and it is pretty quick and simple. I had prepared this for dinner as an accompaniment with thattu-idly (idly steamed in dhokla moulds).
Preparation Time: 15 minutes
Cooking Time: 15 minutes
1. Ripe Tomato – 4
2. Onion – 2
3. Green chilies – 2
4. Curry leaves – 1 sprig
5. Oil – 1 tbsp
6. Mustard seeds – 1 tsp
7. Asafoetida – 1 pinch
8. Turmeric powder – 1 pinch
9. Salt as per taste
Step 1: Chop onion, tomato, chili and curry leaves finely.
Step 2: Heat oil in a pan, splutter mustard seeds, sprinkle asafoetida, add curry leaves and green chilies.
Step 3: Sauté onion in it till translucent.
Step 4: Add in tomatoes and sauté until mushy.
Step 5: Add a cup of water, salt, turmeric and cook in simmer for 5 more minutes.
Step 6: Serve hot or warm with idly/ dosa or pongal.