Rub the frozen knafeh with your fingers to cut it into small pieces.
Meanwhile combine the ingredients of the syrup, bring to a boil then reduce heat, simmer for 10 minutes until thickened, let it cool down to room temperature.
Melt butter and add to the knafeh, mix knafeh and butter with hand.
Brush two identical oven safe pans with a tablespoon each of melted butter - I've used two 12inch
pizza pans- spread half of the knafeh in each pan and press tightly with a bowl.
Bake in a 350F oven until golden brown.
Prepare the Dream Whip according to package direction using the mango juice.
When the knafeh is done drizzle both parts with some syrup.
Turn one part upside down, spread about ⅔ of the cream filling.
Add mango pieces, then the other half of the knafeh.
Decorate with the rest of the whipping cream.