In a mixing bowl add maida, wheat flour, salt, 4 Tsp hot oil, 1 Tsp. Cummins, n ajwain. Now add little by little warm water and form a tight dough. Cover it with wet cloth and allow it to rest 15 minutes.
Now to make stuffing - Heat a pan and 2 Tsp oil. Once its heated add Cummins, asafetida, smashed potatoes, garam masala, sugar and salt. Cook well for 5 minutes. Now allow it to cool. Stuffing is ready.
Now take small dough and prepare small roti. Now cut it into rectangular shape. Now in this make strips in its half portion. Now keep stuffing on remaining (non cut ) portion and roll it. At last join its ends. Prepare all samosas like this.
In a pan heat oil and fry these rolls till it becomes golden brown. Now remove from oil.
Ring Samosa is ready. You can serve with tomato sauce .