Apple-Onion Tart

I hate it that this recipe is good.  Martha went overboard with the prep time on this.  So much so that Emily gave up ever having dinner the night she started making it.  We put everything in the fridge and waited a couple days to get the strength up to finish.  When we sat down to eat, we were ready to dismiss this recipe to the memory hole... but it was good.  The onion and apple really blended their flavors into something a bit unique, and the butter crust went well with it.  Savory but sweet.  Onion soup lovers might want to give this a try.  But don't wait until after Thanksgiving, because it's some work.  You may have noticed a lag in the postings... just getting my feet back on the ground after the holiday.