“This is the dry steamed duck made at the household of Hangzhou merchant He Xingju. Wash a fat duck and chop into eight chunks. Immerse the duck completely with sweet wine and autumn sauce in a porcelain jar and seal it well. Place everything directly in a dry pot to let “steam” over a low flame with not adding water. When it is ready to be served, the ducks meat should be as soft as mud. The dish takes the two incense sticks of time to cook.”
“Dry-steaming” is quite similar to the cooking technique “men” (悶), which means that the food is covered, heated, and then allowed to cook through using the residual heat. From the recipe, we see that the temperature is probably quite a bit higher, almost like low temperature baking. (See Pork 12: Dry steamed pork).