Take another bowl put besan, salt, red chilli powder,baking soda,mix add water and make batter. Heat oil in pan. Now dip the potato masala covered chill in besan and them put in hot oil.deep fry them at medium heat. Remove from heat and keep aside. Beat dahi till smooth add salt and little water mix.on another bowl sock boondi for five mnts remove from water.anf keep aside.