Vetta Kozhambu or sour and spicy curry

Vetta Kozhmabu is a favourite sour and spicy dish in Tamil Nadu. Its one of my husband's favourite dishes and it is very simple to make.
I usually like vendakai/bhindi(okra) in it.But you can put brinjal or only onions and make it too.
Here goes the recipe for yummy vendakai vetta kozhambu

Ingredients

• Tamarind concentrate .It should be thick.I usually use the ready concentrate available in the indian stores -1 tablespoon or 2 teaspoons
• Cut okra or bhindi - 2 cups
• One large onion- sliced longitudinally
• Red chilli powder - one teaspoon
• Sambar powder - 3 teaspoons
• oil- one table spoon
• rice flour - one table spoon
• mustard seeds - one teaspoon
• Urad dal- one tablespoon
• Haldi or turmeric powder - 1/2 teaspoon
  

Procedure

• Heat oil in a kadai or sauce pan.Add mustard seeds and urad dal to it.
• Once the mustard seeds splutter, add the haldi powder and redchilli powder to the oil and mix well
• Now add the sliced onions and fry for 2 mins
• Now add the cut okra and salt and stir the mixture for 5 mins .
• Add the tamarind concentrate mixed in 3 cups of water and the sambar powder . Stir well and let the mixture boil.
• The concept of vetta is to let it boil for about half hr till a lot of water evaporates and the mixture becomes thick.
• Add one spoon of rice flour to make it thicken quickly.
• Keep boiling for about half hr till okra cooks very well and the mixture becomes thick
• Remove from fire and server hot with rice.