Preheat the oven to 400 degrees Fahrenheit.
Add one cup of water to a kettle, then bring it to a boil. Add the cashews to a bowl, then once the water has boiled, pour it over the cashews.
Let the cashews soak in the boiled water for one hour. While the cashews are soaking, peel, then roughly chop the beets.
Add the peeled, chopped beets to a baking dish, along with 1/4 cup of cold water, then cover the dish with a lid or aluminum foil.
Bake the beets for one hour at 400 degrees Fahrenheit or until they are fork tender.
Once the cashews have finished soaking, use a colander to drain and discard the soaking water, rinse the cashews, then add the cashews to the blender or food processor.
Add the cooked beets, fresh lemon juice, lemon zest, garlic clove, 3/4 cup cold water, and salt to the blender or food processor, then blend until smooth and creamy.
Serve this sauce with your favorite pasta. I like to mix the cooked pasta with the blended pink sauce in a pot on the stove set to low-medium heat for a couple of minutes before serving.