1. Combine all the sauce ingredients in a small bowl. Mix well.

2. Bring 5 cups of water to a boil in a large non-stick pan. Cook the noodles for 8 minutes until completely translucent and soft. Rinse the noodles under cold running water. Drain well.

3. Cut the noodles into 6-inch lengths. Transfer to a large mixing bowl. Add 3 tablespoons of the prepared sauce to the bowl and mix well.

4. Fill the same pan with 2 cups of water. Bring it to a boil. Add the spinach and blanch until cooked. Drain quickly and season with a sprinkle of salt.

5. Add ¼ tablespoon of oil to a skillet. Stir fry the noodles over medium heat for 5 minutes until translucent. Transfer back to the mixing bowl.

6. Heat the remaining oil in the skillet over medium heat. Add the carrot and sprinkle with a pinch of salt. Sauté the carrots for a minute. Push them to one side of the pan.

7. Add the onions to the skillet. Sauté for 3 minutes until translucent. Stir in the scallion and sauté for a minute. Transfer them to the bowl with the noodles.

8. Add the beef and mushrooms with 2 tablespoons of the prepared sauce to the skillet. Stir fry for 5 minutes until the meat is cooked. Transfer to the bowl with the noodles.

9. Add the spinach to the bowl. Toss well.

10. Serve immediately.