Heat a large stock pot over medium-high heat. Add the chicken and cook until lightly browned about 5 minutes.
Add the shrimp, spinach, mushrooms, water chestnuts, light brown sugar, rice wine, and soy sauce. Cook for 3 minutes. Add the scallion and ginger and stir to combine.
Add the chicken stock and bring to a boil. Reduce heat and simmer for 15 minutes.
Meanwhile, make the wontons. In a medium bowl, mix together the ground pork, shrimp, light brown sugar, rice wine, soy sauce, scallion and ginger until well combined.
Lay one wonton wrapper on a clean surface. Place 1 tablespoon of the pork and shrimp mixture in the middle of the wrapper. Gently fold two opposite sides together to create a triangle shape, then press down on the edges to seal.
Transfer the wontons to a parchment-lined baking sheet and repeat with remaining wrappers and filling.
Once all the wontons have been made, drop them into the simmering soup and cook for an additional 5 minutes.
Garnish with fresh scallions before serving.