Soak the cashews: If using a high-speed blender, soak cashews in boiling water for 5-10 minutes. For regular blenders, soak the cashews overnight in cold water.
Prepare the zucchini: Peel the zucchini down to the white flesh, removing the green skin.
Blend the ingredients: Combine the peeled zucchini, soaked cashews, coconut milk, maple syrup, vanilla extract, and a pinch of salt in a blender. Blend until smooth and creamy.
Freeze the mixture: Pour the blended mixture into ice-cube trays and freeze for at least 4 hours or overnight.
Process the frozen cubes: Once the mixture is frozen, place the cubes in a food processor. Pulse blend, scraping down the sides, until the ice cream reaches a thick, creamy consistency.
Serve: Scoop the ice cream into bowls and enjoy!