You think you have read about this name somewhere and yes, you are right. Cha ca La Vong is listed as one of the top 100 things you gotta try before you die by many cuisine experts. It is exquisitely grilled fish served with bún, peanut, green onions, dills and shrimp paste. The fish is carefully chosen so that there are not too many bones and fishy smells. A glass of bia hoi or tra da will definitely give your meal more flavour.
Cha ca La Vong restaurant on 14 Cha Ca street is renowned nationally and internationally for its tradition and quality of serving the dish. It is much more expensive than other local food but the fact that you are sitting in one of the oldest house in Hanoi, served by the most traditionally styled chef is all worth it.( $5-8, with drink).