2Prepare the dipping sauce by dissolving sugar in hot water. Add soy sauce, rice vinegar, chili oil, minced garlic, toasted sesame seeds, and sesame oil; stir well.
3In a pan, sauté the mushrooms and tofu until browned.
4In a bowl, combine the sautéed mixture with shredded carrots, spring onions, ginger, garlic, soy sauce, rice vinegar, and cornstarch (optional); mix well.
5Soak one rice paper sheet at a time in warm water until soft but firm. Lay on a damp towel and cut in half.
6Place filling in the center of each rice paper half, fold sides to create a triangle, then roll tightly. Secure with a toothpick.
7Place dumplings on a baking sheet brushed with oil. Brush tops with oil and bake for 10-15 minutes, flipping halfway, until golden brown and crispy.