Boil potato peel it and mash it
In a pan heat oil add cumin,carom,coriander seeds

Saute onion and potato,dry spices,mix and cook well

Another side knead a dough by using flour,salt and nigella seeds,oil...start kneading with water,keep aside

Now make small poori from dough,cut from center,make cone shape and stuff by this filling of potato and deep fry in hot oil