Combine pork, 1 teaspoon soy sauce, sherry and garlic salt; mix well. Let stand 15 minutes. Heat 2 tablespoons oil in hot wok or large skillet over medium-high heat; brown pork mixture in hot oil.
Add bean sprouts, onion and 1 tablespoon soy sauce. Stir-fry until vegetables are tender-crisp; drain and cool.
Dissolve cornstarch in 1/4 cup water. Place about 1/3 cupful pork mixture on lower half of egg roll skin.
Moisten left and right edges withcornstarch mixture. Fold bottom edge up to just cover filling.
Fold left and right edges 1/2 inch over; roll up jelly-roll fashion.
Moisten top egde with cornstarch mixture and seal. Complete all rolls.
Combine biscuit mix, egg and remaining 1/2 cup water in small bowl; dip each roll in batter.
Heat oil for frying in wok or large saucepan over medium-high heat to 370F. Deep fry rolls, a few at a time, in hot oil 5 to 7 minutes, or until golden brown, turning often.
Drain on paper towwels.
Slice each roll into 4 pieces. Serve with hot mustard, catsup and soy sauce as desired. Typed by Syd Bigger.