Cook the pasta according to package directions.
Meanwhile, put all remaining ingredients in your high-speed blender. Blend on high for 30 seconds to a minute, until creamy.
Once the pasta is cooked, save 1 c. of pasta water, and then drain. Put the pasta back in your pot.
Pour the cashew sauce over the pasta, stirring well. Top with additional fresh black pepper as you wish, and enjoy immediately.
Before you put up the leftover pasta, stir in the cup of pasta water and then refrigerate. Pasta will keep for up to 3 days in your fridge.