Wontons are made by spreading a square wrapper flat in the palm of one's hand, placing a small amount of filling in the center, and sealing the wonton into the desired shape by compressing the wrapper's edges together with the fingers. Adhesion may be improved by moistening the wrapper's inner edges, typically by dipping a fingertip into water and running it across the dry dough to dissolve the extra flour. As part of the sealing process, air is pressed out of the interior to avoid rupturing the wonton from internal pressure when cooked.
The most common filling is ground pork and shrimp with a small amount of flour added as a binder. The mixture is seasoned with salt, spices, and often garlic or finely chopped green onion. Factory-made, frozen varieties are sold in supermarkets. Commonly, they are handmade at the point of sale in markets or small restaurants by the proprietor while awaiting customers. In markets, they are sold by the unit, without being pre-cooked.