Take 300 grams of medium-sized rigan (brinjal). Remove the stem and cut each rigan into 4 slices. Then cut the slices into medium-thick chips (refer to the video).
Heat 5–6 tbsp oil in a kadai. Add 1 tsp cumin seeds, ½ tsp mustard seeds, a pinch of hing, and 6–8 garlic cloves. Sauté for a few seconds.
Add 1 cup chopped onion and sauté it well.
Then add 2 green chillies and 1 tbsp ginger-garlic paste. Sauté again.
Add ½ tsp turmeric powder and mix well.
Now add the chopped rigan chips and salt. Mix well, cover, and cook the sabzi on low flame for 5–7 minutes until the rigan becomes soft and properly cooked.
Next, add 1 tbsp red chilli powder, 1 tbsp coriander powder, ½ cup coarsely crushed peanut powder, and ½ cup coarsely crushed gathiya powder. Mix well and cook for 2 minutes so the masala flavours blend and oil starts to release from the sides.
Add 1 glass of buttermilk and mix well. Cook the sabzi for another 2 minutes until oil releases from the sides.
Garnish with coriander leaves and serve hot with bajra roti.