Put the flour in a deep bowl, add the yeast and salt. Add the oil and rub with fingertips. Add water and a pinch of salt a little at a time, mixing thoroughly until dough is binding. Divide into small pieces, place on a tray and put in a warm place for one hour. Put ground meat, onion, salt, pepper and cumin in a frying pan and cook over low heat. Cool. Roll each piece of dough into a round, about 1/16 inch thick. Place a tablespoon of meat in the center of each round and seal then twist the edges. Heat the oil and deep fry the samboosak on both sides. Serve hot. Serves 8-10 persons.