Crust: ground almonds and hazelnuts with a bit of sweetener (agave? maple syrup? golden syrup? turbinado sugar?) and a bit of coconut oil to hold it together. Possibly also a bit of meal made from kosher-for-Passover matzo if the mixture needs help coming together.
Filling: fresh apples, frozen sweet (but unsweetened) cherries, crystalized ginger (ingredients are just ginger and sugar).
I don't have kosher salt, but I could get some if need be. Is that necessary, though? I have "canning salt," which lists as its ingredients "only pure salt"--i.e., no iodine or anti-caking agents or anything. Would that be ok, or does it have to be labeled kosher?