Salty and delicious, you won’t even realize they're not the real thing. Best of all, one serving is a mere 116 calories—less than a third of the calories in a normal serving of potato fries!
Preheat oven to 425°. Peel and cut rutabagas into 1/4-inch slices; stack and cut into 1/4-inch sticks. Toss with rosemary, olive oil, salt, and pepper. Roast at 425° for 12 to 15 minutes, shaking pan often, until browned and tender.