Cook soya chunks as given in this link, drain it, squeeze it and set aside.

Heat oil in a pan, add in all whole spices and let them sizzle.

Now add in onions sprinkle over some salt. Saute till lightly translucent.

Add in spice powders and add a dash of water and cook the spice powders till oil separates.

Add in tomato puree and mix well. Bring it to a boil and simmer till you see thin layer of oil floating on top.

Now add in potatoes and some water. Cover and cook till potatoes are done.

Now add in soya chunks, add more water if needed and cook this for a further 5 mins or so.

Now add in milk and coriander leaves and mix well.

Serve.