Cook the vermicelli as per package instruction. (normally, about 3-5 mins). Drain it well. Cover it a towel. Let it sit for about 15 mins
Heat the pan over medium high heat. Add in 1 tsp of oil. Pan fry the pork until both side golden brown
Add in the mustard (and hot pepper), stir fry until the mustard is dried. Add in the sauce mixture. Adjust the taste accordingly. Thicken the sauce with starch mixture.
Bring the chicken broth and water to boil. Add in the cooked vermicelli. Top with the cooked pork and pickled mustard green mixture.