In a small bowl, whisk together cornstarch and 1/4 cup water; set aside.
Heat canola oil in a large stockpot or Dutch oven over medium heat.
Stir in garlic and ginger until fragrant, about 1 minute.
Stir in mushrooms until wilted, about 3 minutes.
Stir in chicken stock, bamboo shoots, soy sauce, rice vinegar, fish sauce, chili garlic sauce and pepper.
Bring to a boil; reduce heat and simmer until flavors have blended, about 10 minutes. Stir in tofu.
Stir in cornstarch mixture, stirring frequently, until slightly thickened, about 3 minutes.
Gradually add egg in a slow steady stream, stirring with a fork. Cook until the eggs are set, stirring frequently to create ribbons, about 2 minutes.
Remove from heat; stir in green onion and sesame oil.
Serve immediately with crispy wonton strips.
For the crispy wonton strips
Heat vegetable oil in a large stockpot or Dutch oven over medium high heat.
Working in batches, add won ton strips to the Dutch oven and fry until evenly golden brown and crispy, about 1-2 minutes. Transfer to a paper towel-lined plate.