Combine potatoes, carrots, and cashews in a small saucepan. Cover with water. Bring to a simmer over medium heat.
Simmer veggies and cashews until potatoes can easily be pierced with a fork, about 15-20 minutes.
Drain water from the mixture.
Combine all ingredients in a high-speed blender.
Start blending on low speed, gradually increasing to high, while using a tamper to incorporate all ingredients. If you don't have a high-speed blender, you can also make this in a food processor.
Taste and adjust seasonings.
Store in refrigerator until ready to use.