This recipe for lovely candied orange slices is super-easy to make: Just simmer orange slices in sugar and water. The resulting orange-scented syrup is a delicious, and multipurpose, bonus.

A genoise sponge base is soaked in Grand Marnier and topped with oodles of custard and candied orange slices. For this recipe ... be made up to 2 days ahead. Make up to step 12 and store in ...