Cut potatoes, brinjals and tomatoes into large chunks. Heat oil in a pressure cooker. Crackle mustard seeds and then add cumin seeds, asafoetida powder, turmeric powder and green chillies. Next add chilli powder and quickly add the veggies.

Add the rest of the spices, mix well and fry for a minute. Then add water slightly below the level of the veggies. Combine everything and bring it to a big bubble boil.

Cover the cooker and let the whistle release twice on high flame. Turn off the stove and let the cooker cool down. Serve without mixing much or else the veggies will belreak. This shake goes really well with everything, but tastes the best with Puri.