Look for dumpling wrappers in the refrigerated section of the supermarket or specialty Asian markets. Thicker is better when choosing dumpling wrappers, the Northern style is preferred, but gyoza wrappers work well too. If you don't have a bamboo steamer, there are other ways to steam the dumplings. Steamer insert for a stock pot: line the bottom of the steamer with cabbage leaves and arrange the dumplings in a single layer, cover the pot with a tight-fitting lid and cook for 15 to 20 minutes. Vegetable steam basket: line the bottom of the steamer with cabbage leaves and arrange the dumplings in a single layer, cover and cook for 15 to 20 minutes. Be sure to line any steaming device with cabbage leaves or oil-brushed parchment paper.