Scald the pig's trotters with boiling water, that is, (cover) and take them out. The surface of pig's trotters is almost ripe. Add seasoning, pepper, onion, ginger slices, a spoonful of soy sauce in a pressure cooker, add boiling water, mix well, add a little salt chicken essence and cooking wine sugar, add a little color, then simmer on high fire, cover the valve and simmer on low fire. I think that's what my dad does.