Soak the raw cashews in cold water for 4 hours or overnight until soft. Drain and rinse well.
Line the bottom of a 9-inch springform pan with parchment paper and lightly grease the sides with refined coconut oil.
Pulse walnuts in a food processor until coarsely chopped. Add dates and salt and process until a sticky dough forms.
Press the crust mixture firmly and evenly into the bottom of the prepared pan. Freeze while preparing the filling.
Combine drained cashews, coconut cream, maple syrup, lemon juice, lemon zest, melted coconut oil, vanilla, and salt in a high-powered blender.
Blend on high for 3-5 minutes until completely smooth and creamy, scraping down sides as needed.
Pour the cashew filling over the chilled crust and smooth the top with an offset spatula. Tap the pan to remove air bubbles.
Freeze for a minimum of 4-6 hours, preferably overnight, until completely firm.
Thaw at room temperature for 20-30 minutes before serving. Remove from springform pan and top with macerated berries if desired.