Pick up a bag of frozen dim sum and the instruction is usually: steam from frozen, 8 to 13 minutes, until cooked through.
Those last three words mean the thing in your hand is raw, and the last step of manufacturing is yours.
Three states, one freezer aisle
| State | What it means | How to spot it |
|---|---|---|
| Raw | You are cooking it. Undercooking is a safety question. | An internal temperature — 74 °C / 165 °F |
| Fully cooked | You are reheating. A fixed time is enough. | “Fully cooked”, “pre-cooked”, “heat and serve” |
| Unstated | Unknown. Treat as raw. | Neither claim appears |
The name on the front is not evidence.
At least one product in the survey carries a “pre-steamed” descriptor on the front, and its
instructions say cook thoroughly to 74 °C.
Why the category settled on raw
Real reasons, not lazy ones.
- One thermal step instead of two. Cook, blast freeze, reheat puts the product through heat twice. Every pass costs texture.
- Cheaper plant. Cooking at scale needs steam capacity and fast freezing. Forming and freezing raw needs less of both.
- The wrapper survives better raw. A cooked wrapper has already absorbed water — and water is what ice crystals ruin.
The ice crystal problem
- Cooked food frozen slowly forms large ice crystals.
- Large crystals puncture cell walls and starch structures from the inside.
- On thawing the water runs out instead of staying put.
- Result: soggy at the wrapper and dry in the middle, at the same time.
- Blast freezing is the answer — drop the temperature fast enough and the crystals stay too small to do damage.
- Most dumpling producers do not have the equipment. That is a large part of why the category ships raw.
What raw costs the person holding the bag
- The final cook is done on a domestic stove, without a thermometer.
- Undercooking is a safety question — filled dumplings are dense and heat slowly to the centre.
- Overcooking is the usual defence — and why frozen dim sum has a reputation for rubberiness.
- It cannot be a three-minute meal. Cooking from raw is not a three-minute job.
What fully cooked changes
| Raw-frozen | Nourvo | |
|---|---|---|
| Who performs the cook | You | The manufacturer |
| Instruction ends with | “until cooked through” | A fixed time |
| Microwave from frozen | Often not recommended | 3 minutes, two pieces |
| Steam from frozen | 8–13 min, to cook | 10 min, to reheat |
| Undercooking risk | Carried by you | Cooked before freezing |
Ten minutes of reheating and ten minutes of cooking
are not the same instruction.
One is finished when the clock says so. The other when the centre is safe.
Why this is the hardest thing we do.
Getting a cooked dumpling through a freezer without turning it to paste is a formulation
problem before it is a logistics one.
For buyers
Nourvo is available for wholesale, foodservice and distribution in British Columbia.
Wholesale & foodserviceSend a trade enquiry → Or email directinfo@nourvo.caNourvo figures are the current formulation specification. First commercial run August 2026; third-party laboratory analysis is commissioned ahead of first label print. Category figures are read from published Nutrition Facts panels and are sourced on the full comparison.