I like to use the traditional bamboo steamer for these bad boys. Because of the lack of precision in the recipe, I'm never quite sure how many I'll end up with, so using a multi-tier steamer removes any cooking problems that I'd run into with one of the fancier electric steamers. I always spray the inside of the steamer before I lay down the dumplings and then spray the dumplings once I've laid them down. Make sure that none of the dumplings are touching and don't forget to get the water boiling while you are finishing up your prep.