I thought dim sum is healthy cos it's steamed and not much fat/oily content
Supermarket frozen siew mai, har gow, and chives dumplings are highly processed, industrial food products. They are not simply assembled by hand and frozen; they are mass-produced through automated manufacturing lines and often involve a pre-cooking step before freezing to ensure consistency and food safety.
The Industrial Manufacturing Process
While the exact process varies by brand, the production of these frozen dim sum follows a similar large-scale sequence:
· Ingredient Preparation: Meats are ground and vegetables are machine-chopped. For har gow, the wrapper dough is a specific mix of wheat starch, potato starch, and hot water to achieve its translucent texture . Siew mai wrappers are rolled to a specific thickness (around 0.3–0.7 mm) using multi-stage rollers .
· Automated Forming: Industrial machines, often capable of producing up to 10,000 pieces per hour, extrude the dough and deposit the filling. They use specialized molds to clamp the dumplings into their signature shapes (e.g., open-topped for siew mai, pleated crescents for har gow) .
· Pre-Cooking (Steaming): This is a key step for frozen dim sum. After forming, the dumplings are steamed in the factory. This pre-cooks the filling and sets the wrapper, ensuring that the product is safe and easy to reheat later .
· Rapid Freezing & Packaging: The steamed dumplings are quickly frozen using blast freezers to lock in texture and flavor, then automatically packed and passed through X-ray or weight checkers to detect defects .
Ingredient & Texture Notes
Because these are highly processed, the ingredient lists can be long. For example, a supermarket har gow might contain not just prawns and rice flour, but also tapioca starch, cornflour, sugar, sesame oil, yeast extract, and various stabilizers . This processing is what allows them to survive months in a freezer and reheat into a consistent, shelf-stable product. The trade-off for this convenience and affordability is that the texture and flavor will differ from freshly made dim sum in a restaurant.
