1. Make the sauce: In a small bowl, add the soy sauce, rice vinegar, sesame oil, sugar, sesame seeds, and chili oil crisp (if using). Mix until the sugar dissolves and all ingredients are combined.
2. Make the filling: In a medium bowl, add the shrimp, garlic, Chinese chives, ginger, cornstarch, salt, pepper, sesame oil, and soy sauce. Mix until all ingredients are evenly distributed.
3. Bring a large pot of water to a boil.
4. Fold the wontons: Fill a small bowl with water. Orient the wonton skin in your palm like a diamond and place 1 heaping teaspoon of the shrimp mixture in the bottom corner of the skin. Roll from the bottom corner up until the filling is fully covered, then wet the skin to the right of the filling. Using both hands with your fingers facing towards you, pinch the skin to the left and right of the filling to seal, then bring your pinched fingers together to meet each other and tuck the damp skin on the right onto the left to seal shut.
5. Add the wontons to the boiling water in batches and gently stir to prevent them from sticking to the bottom. Boil until they float, 2-3 mins, then remove from the water with a mesh skimmer and transfer to a serving bowl.
6. Drizzle with the sauce and sprinkle with scallions. Enjoy!
