2. Soak pig's trotters and scrape them clean. Cut pig's trotters into pieces (3 cm square).
3. Soak peanuts in warm water and peel them.
4. Chop the onion and slice the ginger.
5. Put the wok on the fire, pour clean water (2500 ml), add pig's trotters, bring to a boil, and skim off the oil slick.
6. Soak and add peanuts and ginger.
7. When the trotters are half cooked, switch to low heat and add refined salt to continue stewing.
8. After stewing pig's trotters, put them in a soup bowl and sprinkle with pepper, monosodium glutamate and chopped green onion.