Lemongrass-Grilled Beef with Noodles and Salad

“Barbecue—the new health food.” It’s not a claim you often hear in the brisket- and rib-loving American heartland. But in many parts of Asia, barbecue is served in a manner consistent with the latest nutritional wisdom; moderate portions of grilled meat are paired with fresh vegetables and explosive spices. In short, a description of Vietnam’s national grilled beef dish, bo bun—thin shavings of lean beef marinated in a pungent mixture of lemongrass, fish sauce, and garlic, then seare