Lemongrass Marinated Beef

We have been planning to cook this for a while but have been distracted by various things along the way.  We got around to it tonight and it was really good.  The vegetables in the marinade (shallots, lemongrass, garlic, chilli) were supposed to be ground to a puree, but our mortar and pestle weren’t really up to the job so it was a bit chunkier than intended.  It still worked well though.  Served with stir-fried pak choi and mange tout and jasmine rice.