Cut fish into an inch cubes. Add marinade and set aside for about 5 minutes
Cut pineapple into small slices. Toast sesame seeds in a dry pan
Coat fish with corn flour and deep-fry until golden brown. Remove and drain well. Scald pineapple and peas briefly in the oil
Heat up the pan and turn off the heat. Put in mayonnaise and lemon juice and mix well. Add fish, pineapple and peas, and toss briefly with mayonnaise. Transfer to a serving dish and scatter over sesame seeds as final touch