Ingredients

  • 1 1/2 to 2 pounds beef tenderloin (filet mignon), trimmed of excess fat and cut into 1-inch cubes
  • 2 tablespoons chopped garlic
  • 2 tablespoons sugar
  • Salt and pepper
  • 5 tablespoons neutral oil, like corn or canola
  • 1/4 cup rice-wine vinegar
  • 1/4 cup rice or white wine
  • 3 tablespoons soy sauce
  • 1 tablespoon fish sauce
  • 1 red onion, peeled and sliced thin
  • 3 scallions, trimmed and cut in 1-inch lengths
  • 2 tablespoons butter
  • 2 bunches watercress, washed and dried, or 1 head red leaf lettuce, washed, dried and separated into leaves
  • 2 limes, cut into wedges

Method

  • Marinate meat with garlic, half the sugar, 1 teaspoon salt, 1/4 teaspoon pepper and 1 tablespoon oil for about 2 hours.
  • (Refrigerate if your kitchen is very warm.)
  • Meanwhile, combine vinegar, remaining sugar, wine, soy sauce and fish sauce.
  • Taste, and add salt and pepper if necessary.
  • Mix about 1 tablespoon salt and 1 teaspoon pepper in a small bowl.
  • Divide the meat into 2 portions, and do the same with the onion and scallions.
  • Put a wok or a large skillet over maximum heat, and add about 2 tablespoons oil.
  • When the oil smokes, add the meat in one layer.
  • Let it sit until a brown crust forms, and turn to brown the other side.
  • Browning should take less than 5 minutes.
  • Add half the onion and half the scallions, and cook, stirring, about 30 seconds.
  • Add about half the vinegar mixture, and shake pan to release the beef, stirring if necessary.
  • Add half the butter, and shake pan until butter melts.
  • Remove meat, and repeat.
  • Serve beef over watercress or lettuce leaves, passing salt and pepper mixture and lime wedges at the table.