The day before, in a medium pot, bring 4 cups of water to a boil. Add the cashews and boil for 10 minutes.
Pour cashews through sieve over a medium size bowl. Transfer the cashews to a high-speed blender. Do not discard the cooking water.
Combine the nutritional yeast, tapioca starch, lemon juice, and 1 cup plus 2 tablespoons of the reserved cooking water in a blender. Blend sauce for 2-3 minutes on high speed, until completely smooth. Add more water if needed to create a thick, creamy sauce.
Pour the mixture back into the pot and heat, stirring over medium heat. Clumps should immediately begin to form.
Continue stirring for 10- 15 minutes, or until the sauce is thickened and stretchy. Remove the pot from the heat and set aside.
Let cool and pour into a flat container. Let cool completely.
Once cooled, place in the freezer and freeze until frozen.
Once frozen, place in the microwave for 1 minute until slightly thawed. Cut cheese into cubes. Place in bowl and refrigerate until ready for use.