Place a large frying pan on a medium-high heat. (Don't add in any oil.) When its hot, use a pair of tongs to grab the soaking meat pieces and place directly into the frying pan. Add in the onion pieces as well. (Note: Do not dump-in the leftover marinade into the frying pan. There's enough marinade already soaked into the meat)
Next, the most important step: Add in water (½ cup) to dilute the marinade.
Once the pan starts to boil, move the meat to one side. Then grab the potato starch noodles out of the water and place into the pan. Add-in the enoki and oyster mushrooms. Then place a lid on and let it simmer for 2 minutes.
After 2 minutes, give the broth a taste. It may taste slightly bland: Add in Soy Sauce (1 Tablespoon), Sesame Oil (1 Tablespoon), and the spring onion slice.
Turn heat off. Garnish with a few shakes of sesame seeds.
Bon Appetit! Eat with a bowl of hot rice.