this is very simple, just washthe pig's stomach.Then put a few pieces ofblack pepper inside,use a toothpick to seal the opening of the pig's stomach. Boil it over high heat first,then switch to low heat to simmer the pig's stomach for an hour.While simmering, clean and peel the yam, then cut it into chunks (do not cut too small; yam can easily burn if cut too small),
after an hour, add the prepared yam and cook together for about 20-30 minutes. This way of cooking makes a very delicious and nutritious soup, especially good for your stomach...