Fried Pork Gyoza with Dipping Sauce

Name: Fried Pork Gyoza with Dipping Sauce
Ingredients: 4 ounces water chestnuts, drained; 3 green onions; 1 egg, lightly beaten; 2 ounces canned pineapple, drained; 1.5 tablespoons gochujang (Korean hot pepper paste); 0.5 tablespoon dried parsley; 1 teaspoon hoisin sauce; 0.5 teaspoon Sriracha sauce; 0.5 teaspoon sesame oil; 0.25 teaspoon ground black pepper; 0.25 teaspoon grated fresh ginger; 0.25 teaspoon fish sauce; 1 (12 ounce) package sausage (such as Old Folks®); 2 (12 ounce) packages round gyoza wrappers; 0.5 cup rice vinegar; 0.5 cup low-sodium soy sauce; 1/3 cup thinly sliced green onions; 1 teaspoon sesame oil; 0.5 teaspoon crushed red pepper flakes; 1 clove garlic, minced; 0.5 teaspoon minced fresh ginger root; vegetable oil for frying