Definition: In this task, you have to generate the title of the recipe given its required ingredients and directions.
Input: ingredients:  '3 pounds celery root, peeled, cut into 1/2' cubes', '3 pounds russet potatoes, peeled, cut into 1' cubes', 'Kosher salt', '2/3 cup heavy cream', '2/3 cup whole milk', '1/2 cup (1 stick) chilled unsalted butter, cut into 1/2' cubes', 'Freshly ground black pepper', '1 tablespoon good-quality hazelnut oil', '1/4 cup coarsely chopped toasted hazelnuts', 'A food mill or potato ricer',<sep> directions: 'Place celery root and potatoes in a large heavy pot. Add cold water to cover; season with salt. Bring to a boil over medium-high heat. Reduce heat; simmer until vegetables can be pierced with a fork, 20-25 minutes.', 'Drain vegetables well. Pass vegetables through food mill or potato ricer into same pot.', 'Meanwhile, bring cream and milk just to a simmer in a medium saucepan; remove from heat. Stir vegetable puree constantly over medium-low heat until excess moisture evaporates, about 2 minutes.', 'Stir butter into puree a few pieces at a time, blending between additions. Remove from heat; slowly fold in cream mixture until a smooth puree forms. Season to taste with salt and pepper. DO AHEAD:', 'Strain hot puree through a medium-mesh sieve into a serving bowl (this makes the texture especially smooth and creamy). Drizzle with oil; scatter hazelnuts over.'

Celery Root Purée With Toasted Hazelnuts 