In 5-quart Dutch oven, place round cooling rack on bottom. Pour boiling water into Dutch oven, almost covering rack. (Water should not touch tamales when they are added.) Place 4 empty corn husks on top of rack. Arrange tamales on rack inside Dutch oven. Cover; turn heat to low. Simmer covered1 hour or until tamales are firm. (Check often, adding more water if necessary during cooking time.) Let tamales stand, uncovered, 10 minutes. Serve warm. Top with chopped cilantro, if desired.