This spicy noodle soup is an invigorating brow wiper.
- 7 tbsp. canola oil
- 3 medium yellow onions, 2 cut into 1" dice, 1 thinly sliced
- 1 tbsp. annatto seeds
- 2 lb. boneless beef shank (shin), halved crosswise, tendon removed and discarded
- 1 lb. boneless pork leg, from the upper butt portion
- Salt and freshly ground black pepper
- 4 lb. beef bones, cut into 2" pieces, boiled for 3 minutes
- 1 1⁄2 lb. fresh pork hock, cut into 1⁄2" slices
- 3 tbsp. plus 2 1⁄2 tsp. Vietnamese fish sauce
- 5 trimmed stalks lemongrass, 4 cut into 3" pieces, bruised;1 minced
- 1 1" chunk Chinese yellow rock sugar
- 3 tbsp. dried chile flakes
- 3 cloves garlic, minced
- 1 tsp. granulated sugar
- 2 tbsp. fine shrimp sauce
- 2 (14-oz.) packages large round bún (Vietnamese rice noodles), boiled, then rinsed with cold water
- 1⁄3 cups chopped rau ra˘m (Vietnamese coriander)
- 3 scallions, green parts only, trimmed and thinly sliced
For the broth: Heat 2 tbsp. oil in a stockpot over medium-high heat. Add diced onions and cook for 2 minutes. Add annatto; cook until onions are yellow, 4–5 minutes. Season beef and pork leg with salt and pepper; push onions to side; add beef and pork. Sear meat for 4–5 minutes; add bones, hocks, and 5 quarts water. Bring to a boil; skim off and discard any scum. Add 3 tbsp. fish sauce, bruised lemongrass, and rock sugar; reduce heat and simmer for 1 hour. Transfer pork leg and hocks to a bowl of cold water; let soak for 10 minutes. Simmer broth for 1 hour more. Repeat soaking and draining with shank. Chill leg, hocks, and shank in refrigerator. Skim fat from broth; strain through a fine sieve.
Combine remaining oil, chile flakes, garlic, and minced lemongrass in a small pot over medium-low heat; gently simmer for 5 minutes. Remove from heat; stir in remaining fish sauce and granulated sugar. Set chile mixture aside.
Bring broth to a boil in a large pot. In a bowl, stir together 1 cup of broth with shrimp sauce; pour into pot through a fine sieve and stir in 1 1⁄2 tbsp. of chile mixture. Season to taste with salt. Divide noodles between 8 bowls. Cut beef and pork across the grain into 1⁄16"-thick slices; top each bowl with slices, followed by sliced onions, rau ra˘m, and scallions. Add hocks to broth; bring to a boil. Ladle 2 cups hot broth with some hock into each bowl. Serve with remaining chile mixture, mint sprigs, sliced thai chiles, and lime wedges, if you like.