Lumpia Shanghai (Filipino Springrolls)

Ingredients

• 1 pound ground pork
• 1/2 pound peeled and deveined shrimp, finely chopped
• 1/2 small yellow onion, finely chopped
• 6 cloves garlic, minced
• 2-inch piece ginger, peeled and minced
• 2 small carrots, peeled and grated on large holes of box grater
• 2 stalks Chinese celery with leaves, finely chopped
• 5 ounces canned water chestnuts, drained and minced
• 1 teaspoon kosher salt
• 1/2 teaspoon freshly ground black pepper
• 2 tablespoons soy sauce
• 2 tablespoons fish sauce
• 1 egg
• 40 6x6-inch spring roll wrappers
• a small bowl of water, to moisten fingers
• vegetable oil, for frying
• 1/4 cup cane vinegar
• 1 large clove garlic, finely minced
• 1 whole Thai bird chili, finely minced
• 1/4 teaspoon freshly ground black pepper