In Vietnam, they tend to serve the rice noodles in a small bowl (or on a plate), the meatballs and grilled meat with the fish sauce in another bowl and the lettuce and herbs in a separate bowl or ...
Add noodles and cook according to package instructions. Drain and set aside. Meanwhile, in a medium bowl whisk together broth, soy sauce, oyster sauce, fish sauce, sugar and Cajun spice.