This is a recipe passed down from my great-grandmother on my father's side -- he missed these so much when my family came to the United States that he taught himself to cook just to make them again. They are, in many ways, the epitome of Shanghainese cooking: flavorful but not overwhelming, savory-sweet, with a bit of shaoxing wine for extra depth. Perfect warming comfort food. If you want a saltier or more intense flavor, increase the amount of soy sauce and sesame oil.
If you have never heard of these, think of jalapeno poppers taken to a whole new level. See, these are poppers on steroids. Well, not really, but they are wrapped in delicious pork.