Apple and Rhubarb Pie with Mascarpone and Ice Cream

There is nothing more pleasing than being invited to someone’s house for dinner and, at the end of the meal, they offer you a slice of warm homemade apple pie. This recipe cranks it up a notch by adding stewed rhubarb but, more importantly, I have turned it into a pizza, so you can make little individual ones for everyone or make a large one where everyone gets a slice.