Heat oven to 180C/160C fan/gas 4.
Pour the custard into a large baking dish.
Toss the apples in the orange zest and
juice, cinnamon and sugar.
Arrange the apples, cut-side up, on top
of the custard and drizzle with any extra
juice from the bowl. Sprinkle over the
granola and bake for 30 mins, until the
apples are soft and piping hot – cover
after 20 mins if the granola is getting
dark. Serve with a drizzle of cream or
a scoop of ice cream, if you like.