Make the filling first by placing the pork, scallions, garlic, egg yolk, soy sauce, ginger, vinegar, sesame oil, salt, and pepper into a medium-sized bowl. Mix until combined.
To fold the wontons, place 1 tsp of the filling into each wrapper.
36 wonton wrappers
Using a little water, moisten the outside edges of the wrapper all the way around.
Fold until two points meet, trying to get as much air out as possible. Place a dab of water at both ends of the left and right of the triangle and fold over onto each other.
Continue until all the filling is used. Cover until you are ready to cook the wontons.
Cook the wontons in boiling water for 5 minutes. After adding each wonton into the pot scrape the bottom of the pan very gently to loosen it from the bottom if it is stuck. Stir occasionally, extremely gently. It is best to do this in batches of about 10 wontons each.
Place cooked wontons on a sheet tray lined with parchment paper until they are all cooked.
For the soup:
In a large stock pot or Dutch oven, heat over medium heat and add in the oil.
2 teaspoons vegetable oil
Place the ginger and garlic in hot oil and cook just until fragrant about 30 seconds.
1 teaspoon fresh ginger, 2 cloves garlic
Add the chicken broth and bouillon and bring to a boil.