Just boil potatoes and make curry with salt, green chillies and Pudina/mint leaves(U can add chilli powder instead of green chillies also) Make a loose batter of wheat flour with a pinch of salt and sambar powder. Now make small balls from this.Cave open this ball in the middle(It should be like a small cave that we do for kozhukkatai).Now add a liitle bit of gingley oil into this dough.Spread this oil well.Now stuff it with the curry u had made.Cover up this masala and then roll this back inrio ball with the stuff.Spread it across as u do for chappathi.Apply oil and make like chappathis.But this needs more oil than normal.This tastes well with tomato chutney/baingan masala.