The National Paralegal College reports that the test was first introduced during a 1970 U.S. Supreme Court case, Lemon v. Kurtzman.
Preheat oven to 450Â°F. Toss parsnips with oil and salt to taste in a shallow (1-inch-deep) baking pan and roast in middle of oven, turning over halfway through cooking, until golden and tender, 30 to 35 minutes total.oss parsnips with oil and salt to taste in a shallow (1-inch-deep) baking pan and roast in middle of oven, turning over halfway through cooking, until golden and tender, 30 to 35 minutes total.
1 Roast for 15 minutes, then turn the oven temperature down to 300Â°F. Let the loin continue roasting for another 30-40 minutes or until the internal temperature reaches 135Â°F. 2  Take the roast out of the oven and cover it with foil.