Heat oil in a wok or heavy bottomed pan on a high flame. Add ginger, garlic, celery, onions and sauté till onions turn translucent. Add cabbage, carrot and mushrooms, reduce flame to medium high and sauté for 3 minutes. Add soya granules and saute for a minute. Add soy sauce and sugar and stir to combine. Season with salt and pepper. Remove from flame and keep aside to cool before placing it inside the wrapper.
1 tablespoon oil, 2 teaspoons finely chopped garlic, 1 teaspoon finely chopped ginger, 2 tablespoons finely chopped celery, ½ cup finely chopped onion, ½ cup finely chopped cabbage, ½ cup finely chopped carrot, ¼ cup finely chopped mushrooms, ½ cup hydrated soya granules, 1 teaspoon soy sauce, ¼ teaspoon sugar, ½ teaspoon salt, ¼ teaspoon pepper