This is the recipe I follow for dal/dhal/dahl/daal tadka/tarka. “Tadka” is a tempered spice-and-oil topping that you add before serving to enhance the flavours of the dal. The ingredients and method are based on one of the dal tadka recipes on the excellent site Vegetable Recipes of India (see recipe). It would be best to use arhar or tuvar dal, but I use red lentils generally since they’re the easiest to find and still taste great. This serves 4 people and is excellent with jeera rice.