Soak the mung bean vermicelli in cold water for 20 minutes or until softened.
Prepare the marinade by mixing all the ingredients.
Heat oil in a pan to medium, add the minced garlic, reduce heat to low, and stir fry until light golden brown, about 1 minute. Add the garlic to the marinade.
Bring the chicken stock to a boil, add the softened mung bean vermicelli and boil for 30 seconds, drain and reserve liquid.
Place the mung bean vermicelli on a deep dish, stir 2 tsp of the marinade into it.
Pat dry the shrimps thoroughly, then toss them in the remaining marinade.
Place the shrimps onto the mung bean vermicelli, and drizzle any remaining marinade onto the shrimps.
Add the reserved chicken stock as well, and steam for 5 minutes.
Sprinkle the green onions and serve.