Combine custard powder and 1/4 cup of the milk in a small jug. Stir until smooth.
Place custard mixture, sugar and remaining milk in a small saucepan over medium-low heat, stirring constantly until custard comes to the boil and thickens. Simmer, stirring for 1 minute.
Blend the custard after getting cold. Crush crackjack biscuits by putting in ziplock with the help of roller.Crush or chop walnuts.
Chop Apple slices very thinly.
Take a flat serving bowl.Place Crushed biscuits in the bowl,then make a layer of chopped apple over the biscuits then Layer of crushed walnuts.
Garnish with apple slices and raisins and chocolate syrup. Apple walnut pudding is ready.Serve after getting chilled.
