In a medium bowl combine the julienned carrot, cucumber, bean sprouts, scallions, water chestnuts, ginger, cilantro, soy sauce and fish sauce. Mix well. Take a rice sheet and dip in warm water. Place it on a clean surface and leave it for a few seconds to soften. Place a spoonful of the mixture in the center of the sheet and fold into a square packet as if you were making a burrito. Repeat with the rest of the rice sheets and mixture. In a small bowl whisk sesame oil, soy sauce, ginger, scallions and cilantro and serve with summer rolls.