Preparation:  Prepare the Filling:  In a wok or large frying pan, heat the sesame oil. Saute ginger until fragrant. Add the cabbage, carrots, bamboo shoots, mushrooms and bok choy. Cook until the vegetables are tender but still crisp. If you are using shrimp, add them to the vegetables as well. Season with soy sauce, salt and pepper. Cook for a few more minutes and then remove from heat.  Assemble the Rolls:  Dip a sheet of rice paper in warm water for a few seconds until it is pliable. Place a portion of the filling in the center of the sheet, folding the sides in and rolling from the bottom up.  Fry the Rolls:  Heat enough oil in a frying pan or wok to fry. Fry the rolls until golden and crispy. Drain them on absorbent paper.  Serve:  Serve the Chinese spring rolls with soy sauce, sweet and sour sauce or your favorite sauce. Enjoy your delicious homemade Chinese spring rolls! You can customize the filling to your preferences and enjoy them as an appetizer or as part of a main meal.