In a wok set over moderately high heat heat the oil until hot.
Add the ginger, onion and celery and stir-fry 1 minute.
Add the cabbage and bean sprouts and stir fry 2 to 3 minutes more, or until vegetables are slightly softened.
Add the pork and shrimp and stir-fry 1 minute more.
Add the chicken stock and sugar, bring the mixture to a boil and stir in the cornstarch mixture.
Simmer until lightly thickened.
Stir in sesame oil, salt and pepper to taste.
In a saucepan have water at a boil. Remove from heat and whisk in cornstarch mixture.
Have ready 12 egg roll wrappers under dampened towel.
Place a portion of the filing in a line diagonally across one corner of wrapper, brush with some of cornstarch paste and fold in the ends.
Roll tightly to make a sealed cylinder. Repeat with remaining wrappers.
Have oil heated to 350° F.
Fry egg rolls, in small batches, turning, for about 4 minutes, or until golden brown.
Transfer to paper towels to drain.
Servings:Servings: 12