Dry roast the coriander seeds, cumin seeds, fenugreek seeds, fennel seeds, cinnamon, cloves, cardamoms bay leaves and chillies to they turn dark brown in colour. Allow to cool.
Powder finely and keep aside.
Pulse the onions, ginger and garlic in a grinder to get a coarse paste. Keep aside.
Heat oil in a pan.
Add the onion paste. Saute till it turns light brown in colour.
Add the bay leaves, cinnamon and cardamoms. Stir for a few seconds.
Tip in the roasted powder and mix well.
Add the pork and mix well.
Add the diluted tamarind mix, vinegar and salt and mix well.
Cover and cook till the pork is cooked through.
Heat oil in a pan.
Add the crushed onion and garlic and saute for a minute.
Add the coriander powder, chilli powder, turmeric powder and pepper powder and fry for a minute.
Tip in the cooked pork, along with gravy, if any.
Cook, stirring occasionally, till you achieve the desired consistency.
Switch off heat and serve hot.