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 Roasting time: At 450 Â°F (232 Â°C), carrots and parsnips will take between 30 and 40 minutes to roast, depending on the thickness of the vegetable. Again, make sure the pieces are a uniform size, so they will all cook at the same rate.  Flavor pairings: Carrots and parsnips are versatile when it comes to flavor pairings.