Chinese Tofu and Vegetable Soup

Name: Chinese Tofu and Vegetable Soup
Ingredients: 5 cups vegetable stock (divided); 4 scallions (chopped); 2 cloves garlic (minced); 1 tablespoon fresh Ginger root (minced); 1 ½ tablespoons soy sauce; 3 stalks Bok Choy (chopped); 1 sweet, red pepper (seeded and julienned); 1 cup diced zucchini; 2 carrots (peeled and sliced); 2 ribs Celery (diced); 1 cup white Mushrooms (sliced); 2 ounces Rice noodles; 1.333 cups canned Bamboo shoots; 1 ½ cups firm Tofu (cut into bite-size cubes); 8 Lemon leaves; Watercress leaf chopped (to garnish)