All I knew was that it has onions, tomatoes, mustard seeds and it was a little bit sweet and spicy. So, I made up my own recipe and prepared this once. From that time onwards, I've made this countless times - it always satisfies me - a very simple dish. But, oh so tasty!
Red Chilli Powder
Chop onions and tomatoes finely into small pieces.
In a pan, add about a tbsp of oil and when that's hot, add 1 tsp of mustard seeds. Add the onions and fry till they are pink. Now, add the tomatoes and fry for a couple of mins. Add salt and red chilli powder to this, add 1-2 cups of water and just stand aside.
Let this boil and reduce.
You will see that the tomatoes are completely cooked and there are no more big pieces of the tomatoes.