Modern Vietnamese cuisine is heavily influenced by the French colonists. However, traditional Vietnamese cuisine is similar to Chinese cooking, only instead of using soy sauce, they use fish sauce almost exclusively. Vietnamese recipes use a lot of lemon grass, lime and kaffir lime.
They also have their own version of Buddhist vegetarian dishes.
Famous Vietnamese dishes:
Shrimp rolls wrapped in rice paper
Phở - beef noodles, a north Vietnam breakfast. However, in the US, it is eaten as lunch and dinner too.