Place the raw cashews in a bowl. Cover and let them soak overnight or for at least 8 hours.
Drain the cashews and put them back in the bowl. Bring a pot of water to a boil. Once boiling, pour the boiling water over the cashews. This step will kill viable bacteria. Drain the cashews.
Add them to a blender with 2/3 cup of water and blend on high speed until smooth and creamy. Scrape down the sides from time to time until everything is smooth.
Transfer the cashew milk to a small bowl or container and stir in the acidophilus powder. Cover with a clean towel or with plastic wrap and let sit at room temperature for about 24 hours (up to 48 hours). The cashew cream is ready when it has a light tangy taste. You should also see some air bubbles. This means the fermentation worked.
Vegan Butter
Melt the coconut oil over low-medium heat. Measure 1 and 1/4 cups of melted coconut oil and put it in a blender. Add 1/2 cup of cultured cashew milk, neutral oil, sunflower lecithin, salt, and carrot juice. Blend on high speed for about 1 minute.
Line a 6x4-inch container with parchment paper. Transfer the mixture to the container and place it in the freezer for at least 1 hour or until firm. Once firm, transfer to the refrigerator. It will become softer after a few hours.
This vegan butter will keep for up to 7 days in the refrigerator. Since this butter contains live cultures, it might get stronger in taste/smell as time passes. It will keep in the freezer for up to two months.
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Notes
Do not overheat the coconut oil. To prevent separation during blending, the coconut oil should be just melted and not hot.
Use refined coconut oil. Since coconut oil is this vegan butter's main ingredient, you absolutely need to use the odorless/flavorless kind. Using regular coconut oil would give the butter an overpowering coconut flavor.
Regarding lecithin: This emulsifier is what allows the cashew cream and different oils to blend together. I tried using both sunflower and soy lecithin, and both work great.
Replacing the acidophilus: You can replace the capsule of Acidophilus with 1/16 teaspoon of mesophilic culture.
To flavor this vegan butter: Follow the recipe as stated. Once firm, let the butter sit on the counter for 1-2 hours or until soft. Stir in your add-ins (herbs, garlic, raisins, cinnamon, or chocolate for a sweet version) and transfer the butter to a container. Place in the refrigerator until firm again.
Recipe inspired by Miyoko's VeganButter and Nutcrafter's Bettah than Buttah, as well as traditional butter-making techniques.