Take gram flour and whole wheat flour in a bowl. Roast cumin seeds, carom seeds, peppercorns and dry pomegranate seeds. Pound them to a powder.
Add green chillies, onion, salt, turmeric powder, coriander leaves and mix well. Add sufficient water and knead. Add one tablespoon of oil and the pounded spice powder and knead into a dough.
Cover and rest the dough for about fifteen minutes. Divide into sixteen equal portions and roll into balls. Further roll each portion into a roti.
Heat a tawa and roast the rotis with a little oil till both sides are well done. Serve hot with a dollop of butter.