Hot and Sour Soup | America's Test Kitchen

Ingredients

• 7 ounces extra-firm tofu, drained
• 4 tablespoons soy sauce
• 1 teaspoon toasted sesame oil
• 3 tablespoons cornstarch, plus an additional 1 1/2 teaspoons
• 1 boneless, center-cut, pork loin chop (1/2 inch thick, about 6 ounces), trimmed of fat and cut into 1 inch by 1/8-inch matchsticks
• 3 tablespoons cold water, plus 1 additional teaspoon
• 1 large egg
• 6 cups low-sodium chicken broth
• 1 cup bamboo shoots (from one 5-ounce can), sliced lengthwise into 1/8-inch-thick strips
• 4 ounces fresh shiitake mushrooms, stems removed, caps sliced 1/4 inch thick (about 1 cup)
• 5 tablespoons Chinese black vinegar or 1 tablespoon red wine vinegar plus 1 tablespoon balsamic vinegar (see note below)
• 2 teaspoons chili oil (see note below)
• 1 teaspoon ground white pepper
• 3 medium scallions, sliced thin