butter mixed with the oil. Heat the coated pan until hot. Remove from the heat and spread half of the zested rice over the bottom of the pan, pressing down well with a spoon. Cover with a mound of the remaining zested rice. Sprinkle the saffron rice over the top. Use the handle of a wooden spoon to make a hole in the center of the rice deep enough to reach the bottom of the pan. Make 2 or 3 additional holes in the rice to allow steam to escape. Drizzle rice with remaining 4 tablespoons of melted butter. Cook rice for 6 minutes over low heat, uncovered. Wrap lid in a linen towel, securing towel ends under or around lid handle. Cover the pot with the towel-wrapped lid and steam over low heat for 40 to 60 minutes, until a crisp golden crust forms on the bottom of the rice. Remove pan from heat and let stand for 10 minutes. SERVING: Spoon soft, fluffy rice onto a platter. Break the bottom crust into pieces and arrange around the fluffy rice. Serve immediately