Boil the cashews. Bring a medium pot of water to a boil, add the cashews, and cook for 15 minutes. Drain and set aside.
Make the crust. In a large food processor, pulse the graham crackers until fine crumbles form. Then add some coconut oil and a pinch of salt, and pulse until well combined.
Transfer the crumbles into an 8-inch springform pan, spread evenly, and press firmly into the bottom. Set aside.
Make the pumpkin batter. Into the same food processor (no need to rinse), add cashews, tofu, pumpkin puree, sugar, corn starch, lemon juice, tangerine zest and juice, pumpkin spice, sea salt, and vanilla extract. Process until very smooth (about 3-4 minutes).
Pour the cheesecake batter into the prepared springform pan and gently spread with a spoon. To insure against leaks, place the pan on a cookie sheet.
Bake it & cool it! Transfer to the center rack of your oven and bake on 350°F (175°C) for about 35 minutes. Allow to cool completely. Transfer the pumpkin cheesecake into the fridge and refrigerate for 4 hours, or overnight. Serve with coconut whipped cream, if desired.