Pour oil into a deep fryer or large heavy saucepan to a depth of 2" or 3" and heat the oil until it reaches a temperature of 375ºF.on a deep frying thermometer. Combine pork, eggs, fish sauce, coriander, parsley and white pepper in a mixing bowl and beat vigorously with a spoon until the ingredients are well blended. With a small metal spatula or table knife, spread about 1 tablespoon of the pork mixture on each bread square, mounding it slightly in the center. Drop 5 or 6 of the bread squares at a time into the hot oil, pork side up, and fry them for about 5 minutes. Turn them gently with a slotted spatula and fry for 2 minutes longer, or until no traces of pink remain in the pork and the bread is golden brown and crisp. Gently press a gherkin round into the center of each square to garnish the pork. Serve hot. Makes 24