In a large bowl, combine 1 tablespoon soy sauce, sesame oil, green onions, garlic, sesame seeds, 1 teaspoon sugar, and 1/4 teaspoon pepper. Stir in sliced beef, and marinate at room temperature for 15 minutes.
Heat wok or large skillet over medium-high heat, then drizzle with oil. Cook beef until evenly brown. Stir in carrots, bamboo shoots, napa cabbage, and spinach. Add cellophane noodles, 2 tablespoons soy sauce, 1 tablespoon sugar, 1/2 teaspoon salt, and 1/4 teaspoon pepper. Reduce heat to medium, and cook until heated through.