Mini custard APPLE tarts with walnuts (no added sugar)

Mini Sugar Free Apple Tarts In England and Ireland apples are as popular in Fall as pumpkin spice.  Apples play a big role at Halloween.  Bobbing for apples was our #1 sport on Halloween.   As a kid growing up in the West of Ireland, we waited every fall for the apple man to arrive.  He sold cooking or crab apples which were incredible for baking with.  I have never seen these apples in the US and the closest I can...