Melt, in a large frying pan over medium heat, the butter. Add the apples and powder sugar. Cook while tossing occasionally, until the apples are tender, and the sugar has caramelized to a beautiful light golden brown color. Add the Moscato wine and stir. Set aside.
When the apples are almost cooked, in a saucepan over medium-high heat, add the milk, sugar, vanilla seeds, and the pod. Once the sugar has dissolved, bring it to a simmer and add the semolina to the milk in a steady stream while whisking continuously. Remove the vanilla pods and discard them. Continue whisking until the semolina is thick and smooth, around 5-8 minutes.
Remove from heat, whisk in the butter. Serve the pudding hot topped with caramelized pears and syrup.