Mix beef and baking soda in a bowl and set aside in fridge. Mix garlic, 1 teaspoon sugar, 1/4 teaspoon black pepper, 2 teaspoons soy sauce, and 1 teaspoon of toasted sesame oil.

Make the egg garnish (jidan): Separate egg in 2 small bowls. Beat in a pinch of salt with a fork.

Add 1 teaspoon of vegetable oil to a heated nonstick pan. Wipe off the excess oil with paper towel so only a thin layer remains. Turn off heat and pour the egg yolk into the pan. Tilt it around so the mixture spreads thinly. Cook using the remaining heat in the pan for about 1 minute. Flip it over and let it sit on the pan for 1 more minute. Repeat with white. Let it cool and slice it into thin strips

Prepare noodles and vegetables: In large pot of boiling water add spinach and blanch for 30 seconds then take it out with a slotted spoon to a strainer. Let the water keep boiling to cook the noodles.

Rinse spinach in cold water to stop cooking. Squeeze to remove any excess water. Cut it a few times and put it into large bowl. Mix with 1 teaspoon soy sauce and 1 teaspoon toasted sesame oil.

Put the noodles into the boiling water and stir so they dont stick together. Cover and keep cooking for another 7 minutes until the noodles are soft and chewy.

Strain and cut them a few times with kitchen scissors. Put the noodles into the bowl next to the spinach. Add 2 teaspoons toasted sesame oil, 1 teaspoon soy sauce, and 1 teaspoon sugar. Mix well by hand or a wooden spoon. This process will season the noodles and also keep the noodles from sticking to each other.

Heat skillet over medium high heat. Add 2 teaspoons vegetable oil with both onions. Stir-fry about 2 minutes until the onion looks a little translucent. Transfer to the bowl.

Heat up the skillet again and add 2 teaspoons vegetable oil. Add mushrooms and a pinch of salt. Stir-fry for 2 minutes until softened and a little juicy. Transfer to the noodle bowl.

Heat up the skillet and add 1 teaspoon vegetable oil. Add the carrot and stir-fry for 20 seconds. Add the red bell pepper strips and stir-fry another 20 seconds. Transfer to the noodle bowl.

Heat up the skillet and add 2 teaspoons vegetable oil. Add the beef mixture and stir fry for a few minutes. Toss sauce in. Transfer to the noodle bowl. M

Add 1 minced garlic, 1 tablespoon soy sauce, 1 tablespoon sugar, 1/2 teaspoon ground black pepper, and 2 teaspoons of toasted sesame oil to the mixing bowl. Mix all together by hand.

Add egg garnish and 1 tablespoon sesame seeds. Mix and transfer it to a large plate and serve.