Lightly break the lentils with a wooden spoon such that they are not purxe9ed but still retain a lot of their texture.
Heat the oil in a pan and add the mustard seeds. When they splutter, turn down the heat to minimum and add the coriander powder, cumin powder, amchur powder, red chilli powder, turmeric powder, the red chillies and the curry leaves.
Stir quickly a couple of times taking care that the spices do not burn.
Now add the lentils and about a cup of the liquid saved from cooking the lentils. If this liquid proves insufficient add some water. Add the salt, stir well and bring the lentils to a boil.
Turn down the heat to medium and cook for about 3 to 5 minutes till the dal has come together. Add a little water, if necessary to thin the dal if required.
The tadka dal, when done, should be the consistency of a thick pouring sauce, neither too thick nor too thin.
Serve hot as main side dish, with chappathis or parathas. This lentil preparation can also be thinned odwn a bit and served as soup with bread.