Grease 2 baking sheets, or two 9x5 inch loaf pans, or 1 of each. Divide dough in half. Separate each half into thirds. Rollinto ropes 12 to 13 inches long. Make 2 braids with ropes, tucking ends under.
Transfer loaves to prepared pans.
Pour boiling water into 2 medium ovenproof glass bowls. Arrange pans with loaves over water. Bake until golden, about 15 minutes. Turn loaves out onto racks and cool slightly. Serve warm or allow to cool, wrap with plastic and store at room temperature.