Peel and slice the apples into pieces about 1/8 in thick.
In a lidded container (I used a zip lock box), toss the apples and 1/2 cup raisins with the agave, lemon juice, cinnamon, and pumpkin pie spice until well coated.
Spread out on a lined dehydrator sheet and dry for about 2 hours, stirring once or twice. This isn't meant to dry the apples, but to soften them and let the flavor intensify.
In a food processor fitted with the "S" blade, process the walnuts and one cup raisins until the mix starts to stick together. This takes a couple of minutes.
Press the mix into the bottom and 2 inches up the sides of an 8-inch springform pan.
Put in the freezer for a half-hour to firm.
In a bullet type blender, puree the almond butter, agave, olive oil, and water until very smooth.
Spoon the apple mixture from the dehydrator into the chilled pie crust and pour the caramel evenly on top.
Chill for at least 2 hours before serving.
This is delicious served with a scoop of vanilla n'ice cream!