To make the crumble topping, place the nuts, dates, and flax into a food processor, and process until the mixture is crumbly, being careful not to over mix, You want the mixture to still be loose. Transfer to a small bowl and set aside.
To make the apple filling, toss the chopped apples and lemon juice together in a medium bowl. Set aside.
To make the applesauce, place the apples, dates, raisins, lemon juice, cinnamon, and nutmeg into the food processor, and process to the consistency of applesauce, adding a little water as needed.
Stir the applesauce into the bowl of chopped apples and lemon juice. Serve with crumble topping sprinkled on top.