When stewing pig's trotters, vinegar has the following advantages-
1. vinegar can accelerate the decomposition of fat in pig's trotters and ensure that saturated fatty acids are converted into unsaturated fatty acids, which is not only beneficial to human health, but also makes pig's trotters tender but not greasy;
2. Vinegar can remove the fishy smell of pig's trotters;
3. vinegar can make pig's trotters stew quickly.