Many Vietnamese dishes require this delicate scallion- flavored oil. Brushed over noodles, barbecued meats, vegetables or breads, it complements each item. Heat the oil in a small saucepan until hot but not smoking, about 300 degrees F. Remove the pan from the heat and add the sliced scallions. Let the mixture steep at room temperature until completely cooled. This oil mixture will keep stored in a tightly covered jar at room temperature for 1 week. Yield: 1/4 cup