Mix all the four flours. Place in a muslin cloth and tie with a string. Place in a steamer and steam for 20 minutes. Remove the string and beat the ball of flours with a wooden spoon to powder it. Sift to remove any lumps, powder the lumps and sift again. Add rest of the ingredients except the oil. Add water little at a time and knead into a soft but not sticky dough. Place some dough in the chakli press and make discs of concentric circles, on a piece of butter paper or plastic sheet. Transfer the discs carefully into moderately hot oil and fry till crisp. Use all the dough thus. Cool and store in in tight container.