Ingredients

Fresh tomatoes(big) 3 nos.
Medium size onion 1
Dry red chillies 3 (upto 6 ,depending on how hot you want it) or Red chilli powder 1tsp.(or more)
Garlic ,crushed 3 cloves
vegetable oil 1 tbsp
salt to taste

Seasoning
oil 1 tsp.
Mustard seeds 1 tsp.
Urud dal(optional) i tsp.

Method
Finely chop the tomatoes and onions.
Heat oil in a pan.
If you are using chillies, add chillies.
Fry for 15 seconds.Remove them from pan.Keep them aside.
Add onions.
Add garlic.
Saute for 3 minutes or until edges turn brown.
Add tomatoes.
Add salt.
Add chilli powder
Cook for upto 10 minutes so that the water from the tomatoes has evaporated.Turn the contents frequently.
Let everything cool.
Transfer the contents of the pan into a blender (along with the fried chillies)
Grind to make a paste.

Seasoning
Heat oil.
Pop mustard seeds.
Add urud dal.
Wait till dal turns light brown.
Mix the seasoning with the paste.


Orginal source of the recipe - http://www.ammas.com