Chāshū is my favorite meat ingredient for ramen. Just like ramen, it came to Japanese cuisine from China and transformed into a very different dish. Originally, char siu 叉燒 is a kind of barbecued pork in Cantonese cuisine. In Japan, it is meaty pork belly slowly cooked in a flavorful broth. At the end of cooking, pork belly loses a lot of fat and becomes very tender and soft. Every bite of chashu melts in the mouth. For ramen, chashu os served thinly sliced. A very similar Japanese recipe for cooking pork belly to serve it with cooked rice, hot mustard sauce, and pickled vegetables is called Buta no Kakuni (豚の角煮, “pork cut square and simmered”). For both recipes, pork belly can be skinless or with pigskin, based on personal preferences and availability.
As I mentioned earlier, Salo in a Jar (сало в банке) is a highly popular way of wet curing salo at home, and there are recipes with cold and hot brine. But where the idea hot brine comes from? Can I speculate that someone impatient decided to try it hot? The result was somewhat in between cured and cooked salo, which is another widely used cooking method for pork belly in Ukraine. Cured with hot brine salo was so pleasing that the recipe quickly became popular. Using sous vide allows full time and temperature control in this recipe.