*Soak the cashews in water for at least 8 hours (or overnight) so they soften up and are easy to blend. When the cashews are done soaking, drain the water and rinse the cashews thoroughly. If you're using truly raw cashews, you might want to boil them for 1-2 minutes to kill any pathogenic bacteria.
**If possible, choose probiotic capsules that offer several strains of Lactobacillus bacteria, as well as beneficial Streptococcus thermophilus and Bifidobacterium strains. This will create a more complex sour cream flavor than using Lactobacillus acidophilus alone.
***You can add lemon juice for more sour flavor.
****Prep time does not include soaking the cashews (8 hours).