Lumpia Fried Spring Rolls

Name: Lumpia (Fried Spring Rolls)
Ingredients: 1 lb. ground pork; ½ cup finely chopped carrot; ½ cup finely chopped yellow onion; 3 garlic cloves, finely chopped; 1 tsp. fine salt, plus more for serving; ¼ tsp. freshly ground black pepper; One 14-oz. package 6-in. square spring roll wrappers; 1 large egg, lightly beaten; Vegetable oil, for frying; 1 cup white vinegar; ¼ cup soy sauce; 2 Tbsp. sugar; ¾ tsp. black peppercorns; 2 garlic cloves, finely chopped; 2 red bird’s eye chiles, stemmed and thinly sliced