Drain pineapple tidbits, adding pineapple and half the juice to a small saucepan.
Add mango and sugar in the pan as well.
Heat over medium heat until boiling fruit juice gently. Meanwhile, mix the cornstarch with remaining pineapple juice.
Add the corn juice cornstarch mixture into the pan and stir. Cook the fruit until the sauce thickens, the sugar dissolves and the mango becomes a little soft.
Cool completely before assembling the trifle.
For white chocolate macadamia mousse: Heat 1/3 cup cream in a cup or bowl measuring the microwave for about 45 seconds, or until it is very hot but not boiling.
Add the chocolate in a small bowl and pour over the hot cream. Stir to melt the chocolate and allow to cool to room temperature.
While the chocolate cools, beat the remaining cream until it forms stiff peaks.
Fold into cooled melted chocolate whipped cream. If the cream will deflate slightly, whisk for a few seconds. Stir in macadamia nuts.
To assemble trifle: Cut the cake into 1-inch cubes. Arrange a single layer of cubes on the bottom of a dish or bowl unclear.
Pour 1/3 of the fruit on the cooled cake and third foam. Add another layer of cake and repeat with the fruit and foam. Trifle should have 3 layers when finished.
Garnish with a few chocolate chips and let cool in the refrigerator at least one hour before serving.
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