Pork and Mushroom Golden Bags

Name: Pork and Mushroom Golden Bags
Ingredients: 8 dried shiitake mushrooms; 1/2 lb. (250 g) ground pork; 1 cup (3 oz./90 g) chopped Chinese garlic chives, or 3/4 cup (2 oz./60 g) chopped green onions; 2 Tbs. oyster sauce; 1 tsp. Asian sesame oil; 1/2 tsp. kosher salt; 1/4 tsp. ground white pepper; 15 square 6-inch (15-cm) spring roll wrappers; Fifteen 4-inch (10-cm) lengths of green onion, dark and light green portions only; Vegetable oil for frying; Sweet chili sauce for serving (optional)