Soak half cup channa dhal,half cup urad dhal, half cup thur dhal and half cup pasi dhal. Soak them together for couple of hours. Also soak 1 cup of rice and grind rice seperately and then the dhals, with red chillies and mix them all with salt and leave it overnight. You may grind and make them immediately too. When making adai, add cut onions/coconut cuttings. To make it spicier, When you grind the dhal add cumin seeds, ginger, curry leaves and onions.