Grind mustard: Grind 1 tsp mustard seeds with 1 green chilli and a pinch of salt to a coarse paste.
Blend: Add grated dosakaya, roasted dals, fried chillies, mustard paste, a tiny piece of tamarind and salt to a blender. Blend to a coarse paste — keep some texture.
Taste: Dosakaya pachadi should be tangy from the cucumber with a mustard kick.
Make tempering: Heat 2 tbsp oil. Add 1 tsp mustard seeds. When they pop add 2 dried red chillies, a pinch of asafoetida and curry leaves.
Pour tempering: Pour sizzling tempering over the pachadi. Mix well.
Chill briefly: Refrigerate for 15 minutes before serving — this pachadi tastes better cold.
Adjust: Taste and add salt.
Serve: Dosakaya pachadi is refreshing and tangy. Serve with hot steamed rice and ghee.