Start by soaking the raw cashews in boiling water for at least 10 minutes to soften them. Alternatively, you can soak the cashews overnight for optimal creaminess.
Juice the lime and remove any seeds.
Peel the rambutan skin and cut away the flesh with a knife. Peeling the rambutan flesh away from the seed only works with a knife because the inner shell of the seed can get stuck when peeled.
In a blender, combine the soaked cashews, rambutans, coconut cream, lime juice, maple syrup, and a pinch of salt. Blend until smooth and creamy, ensuring that all ingredients are well incorporated.
Pour the mixture into an ice cube tray. Allow the ice cream base to set in the freezer for at least 8 hours or overnight until firm.
Once the ice cream base is frozen, transfer the frozen cubes into a food processor or high-speed blender. Blend until smooth and creamy, scraping down the sides as needed to achieve a consistent texture.
Serve the dairy-free lychee ice cream immediately using an ice cream scoop for perfect scoops.