I like to soak my cashews in hot water for about 2 hours. Drain and rinse thoroughly
In a high-speed blender, combine all ingredients, blend until completely smooth. Sauce should be warm by the end of blending, if not, transfer it to a saucepan to heat before serving.
Once cheese sauce is made, you are ready to create your shepherds pie.
Heat oven to 350°. Spray a baking dish (approx. 9x13) place the hamburger layer on the bottom. Carefully layer the turnips (hopefully they aren't too mushy, if so cook for less time next time). Sprinkle turnips with seasoning of choice (Season All, Mrs. Dash, etc). Place the cheese sauce on top. Place in oven and cook for approx. 20-30 min. or until heated through.