Thaw the wrappers: Defrost the sealed package in the refrigerator overnight. Keep opened wrappers covered with a damp cloth.
Mix the filling: Combine pork, shrimp, vegetables, mushrooms, scallions, vermicelli, one whole egg, oyster sauce, sesame oil, salt, sugar, and pepper until evenly mixed.
Fill and roll: Place about three tablespoons of filling near the bottom corner of a wrapper. Fold, tuck in the sides, roll tightly, and seal the final edge with egg yolk.
Heat the oil: Bring neutral oil to 180°C. Fry in small batches without overcrowding.
Fry: Cook for 3 to 4 minutes, turning occasionally, until deeply golden and crisp. Drain before serving.
Serve: Enjoy warm with rice vinegar, soy sauce, garlic, chili, and sugar dipping sauce.