Make the wonton filling

• Combine the ground pork, chopped onion, oyster sauce, sesame oil, salt, sugar, black pepper and flour in a bowl.
• Mix until the filling becomes sticky and well combined.

Fold the wontons

• Place a small spoonful of filling in the center of each wrapper without overfilling.
• Brush water around the edges, fold over, press out the air and seal.
• Bring the corners together to form the wonton shape.

Boil the wontons

• Cook the wontons in boiling water until they float and the filling is cooked through.

Build the broth

• Heat the oil in a pot and sauté the onion and ginger until fragrant.
• Add the chicken broth and soy sauce, then bring to a boil.

Finish the soup

• Add the wontons and bok choy to the broth and cook until the greens soften.

Serve

• Ladle the wontons, bok choy and broth into bowls.
• Top with green onions and a few drops of sesame oil.