| 1 |
Prepare the beef and marinade: Thinly slice the beef against the grain into strips that are 1 inch wide by 2 inches long. Mix the beef with the garlic, shallot, sugar, fish sauce and black pepper to taste in a bowl. Marinate for 30 minutes. |
| 2 |
Meanwhile, prepare the soup: If using water spinach, wash it first. Smash the stems with the back of a heavy cleaver. Cut into 2-inch sections. If using fresh spinach, do not remove the stems; clean with several changes of water to remove any sand; drain. |
| 3 |
In a 3-quart saucepan, bring 5 cups of water to a boil. Add the spinach and bring back to a boil. Season the broth with the fish sauce. Add the beef and turn off the heat. Separate the beef slices with chopstick or a fork and stir to heat through. Stir in the lemon juice. |
| 4 |
Ladle the soup into a heated tureen and sprinkle with freshly ground black pepper. Serve with the hot chile pepper on the side, if desired. |
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