Set a wok over high heat. Add the vegetable oil and heat until smoking. Add the pickled garlic and ginger and stir-fry for 10 seconds. Add the chicken and stir-fry until almost cooked through, about 3 minutes. Add the tomatoes and stir-fry for 1 minute. Add the pickled vegetables and chiles, pickling liquid and the remaining 2 tablespoons of soy sauce and stir-fry for 10 seconds to blend. Season with salt and pepper and stir in the sesame oil. Serve at once with steamed rice.