Bring broth to a simmer in a 2 quart saucepan. Add soy sauce, mushrooms and garlic chili sauce. Simmer for 5 minutes. Add pepper, vinegar, bamboo shoots and tofu. Simmer for 5 minutes. Combine the cornstarch and water. Stir until mixture is smooth. Add to soup and stir well. Simmer for 5 minutes until thickened. Pour beaten egg in slowly and stir soup in one direction. Stir to combine. Take off heat. Serve w/ garnish of green onions.