Definition: In this task, you have to generate the title of the recipe given its required ingredients and directions.
Input: ingredients:  '2 pounds Yukon Gold potatoes (about 5 medium)', '1 3/4 pounds turnips (about 5 medium)', '1/4 cup (1/2 stick) butter', '1/2 cup grated pecorino Romano cheese, divided', 'Pinch of ground nutmeg',<sep> directions: 'Butter 11x7x2-inch glass or ceramic baking dish.', 'Cook potatoes and turnips in heavy large pot of boiling salted water until tender, about 35 minutes.', 'Drain.', 'Cool vegetables slightly and peel.', 'Cut into large chunks; place in food processor.', 'Add butter and process until smooth, scraping down sides of bowl occasionally.', 'Add 1/4 cup cheese and pinch of ground nutmeg; blend briefly.', 'Season puree to taste with salt and pepper.', 'Spoon into prepared dish.', 'Sprinkle with remaining 1/4 cup cheese.', '(Gratin can be prepared 1 day ahead.', 'Cover and chill.)', 'Preheat oven to 425F.', 'Bake gratin uncovered until vegetables are hot and top is golden, about 25 minutes.'

Mashed Potato and Turnip Gratin