Arrange the tamales in a steamer, open ends facing up. Place some of the unused corn husks (and/or a wrung-out wet tea towel) over the tamales to help absorb steam. Pour boiling water into the bottom of the steamer to a depth of at least 1 inch. Cover tightly and bring quickly to a full boil over high heat.
Reduce the heat to medium-low to maintain gentle bubbling.
Cook for about 1 hour or until husks pull away from filling. Replenish boiling water as needed.
Let the tamales stand 10 minutes before serving.