Quite simple and heavenly to have. The usual combo for this is Paruppu Thogayal, made with Tur Dal. Whole process will take less than 15 minutes.
Tamarind - Lemon sized
Tur Dal -1 Tsp
Pepper -1 Tsp
Red chilli- 2
Hing - A pinch
Curry Leaves (opt) – 2 springs
Heat Tava. Pour 1 or 2 spoons of oil and fry all the ingredients (To grind) till the aroma comes. Grind to paste adding little water.
Make tamarind extract to about 1 cup.
In a tava, temper Mustard and add tamarind extract and boil for few mins.
Once it starts boiling, add the ground mixture, add salt and let it boil.
In few minutes the whole mixture will thicken itself. Switch off.