Pour chicken stock into a large pot. Stir the crumbled ground pork into the stock, and simmer over medium heat until the pork is cooked through and no longer pink, about 15 minutes. Stir in the cabbage, bean sprouts, green onions, corn, mushrooms, ginger, garlic, vinegar, sesame oil, Szechwan sauce, soy sauce, and cayenne pepper, and cook 5 minutes more. Adjust seasonings to taste.
