Soak the chillies in hot water for 30 mins to overnight
Soak the tamarind for 30 mins
In a food processor add the chillies, tamarind, ginger, garlic, cumin seeds, peppercorns,, cinnamon, cardamoms, cloves & turmeric
Add water a little at a time till smooth
In a sauce pan add some oil and add the potatoes and cook till half done and keep aside
Add the onion and green chillies
Add the tomatoes, cover and cook till the tomatoes are mushy
Add the ground masala and cook
Remove and keep aside
Add the beef cubes and allow to brown
Add the onion, tomato and ground paste back in
Add the stock cube and 1 cup of water
Add the potatoes back in, and salt to taste and cook for 10 - 15 mins till the beef is tender
Add the vinegar, stir and it’s ready to serve