Steamed green shells Qian's way

I am really lucky with my new flatmate. In fact, she's much better than having a boyfriend. She can cook, cleans, is incredibly polite and lovely, yet independent.
When she first came round to view the flat Qian told me she couldn't cook. That must have been Chinese modesty speaking there because in fact she is a brilliant cook.
When a friend of hers came round the other day, she did not only cook one dish but four. And all of them were super tasty. My favourite were her green shells with black bean and garlic sauce, fresh garlic and spring onions. So yummy and so simple!
Steamed green shells Qian's way, for 1-2
: 8 frozen green shells, defrosted
: 1/2 tsp freshly chopped garlic
: 1 tsp chopped spring onions
: 1/2 tsp black bean paste with garlic

Brush the mussels with a little black bean paste, then sprinkle with garlic and spring onions.
Place them with the shell side down in bamboo or metal steamer and steam for 3-5 minutes.
Serve with some rice vermicelli (steamed with the mussels) and a drizzle of soy sauce.
That's it really, couldn't be simpler. According to Qian one should take off the garlic and onions before eating the mussles, but since I like both garlic and onions I simply devoured the whole thing (ok, not the shell though ;-)