Spring rolls with chilli plum sauce

Name: Spring rolls with chilli plum sauce
Ingredients: 6 dried shiitake mushrooms; 200 gram pork mince; 2 chinese cabbage leaves, shredded finely; 1 stick (75g) celery, trimmed, shredded finely; 1 small (70g) carrot, grated finely; 1/2 cup (45g) bean sprouts; 1 green onion, sliced thinly; 1 teaspoon chopped fresh coriander leaves; 1 teaspoon peanut oil; 1 clove garlic, crushed; 1 tablespoon light soy sauce; 1 tablespoon oyster sauce; 36 x 12.5mm square mini spring roll wrappers; 1 egg, beaten lightly; vegetable oil for deep-frying; 1 cup (250ml) plum sauce; 1 tablespoon soy sauce; 1 teaspoon finely grated fresh ginger; 1 small fresh chilli, seeded, chopped finely