In a small bowl: combine all the sauce ingredients together and mix. Set aside.
In pot: add water and bring it to a boil.
Place dry ramen in the pot. Follow the instruction on the package for cook time.
Using a wok: Heat oil to medium-high for 30 seconds.
Then add the garlic and shallot. Cook for 30-60 seconds or until fragrant.
Add sliced mushrooms, cook for 3-4 minutes.
Add choy sum stems, cook for 1-2 minutes. Add the rest of the choy sum and cook for another 1 minute or until slighty tender.
Add cooked ramen noodles. Pour the sauce mixture on top of the noodles. Mix and toss well.