Preheat oven to 200ºC . In a large bowl, mix flour, salt, cayenne pepper, and cheese thoroughly. Add melted margarine and mix. Chill dough in refrigerator for 20 minutes. Place dough on a large, floured board. Place a large piece of waxed paper on top of dough or use a heavily-floured rolling pin. Roll dough to 1 cm thick. Remove wax paper. Holding a fork upside down, draw the prongs vertically along dough from top to bottom, making ridges. With a wide, flat knife cut dough into rectangular shapes 3 x 3 cm. Oil a cookie sheet and place cut cheese on it. Bake in 200ºC oven for 10-12 minutes until cheese straws look dry but not brown. Let cool. Repeat procedure until all of dough is baked. Serve at room-temperature. Freezes well. Yields 7 dozen.