Heat the oil over med-high heat in a large cast iron skillet. Add the beef, onions, and garlic and cook while stirring for 12-15 minutes. Combine the hot beef stock, with the tomato paste & the tamarind concentrate in a bowl and alow to stand until all of the tamarinf concentrate is disolved, approx. 8-10 minutes. Add this mixture to the beef as well as all of the other ingredients, reduce heat to low, cover and simmer for 1 1/2 hours. Be sure to stir occassionaly. Add stock as needed if the liquid reduces too much. Add the sugar and walnuts and simmer for 15 more minutes.
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