Definition: In this task, you have to generate the title of the recipe given its required ingredients and directions.
Input: ingredients:  'a large leek', 'butter', 'leftover mashed potatoes', 'cheese anything you have around that needs using',<sep> directions: 'Wash and chop the leek, then let it cook in a generous amount of butter, covered with a lid and a piece of wax paper if you wish, until soft.', 'Season with salt and then scoop into a shallow ovenproof dish.', 'Tip the mashed potatoes on top of the leeks.', 'Level them a little without packing them down too tightly.', 'Dot small knobs of butter over the surface, cover with grated or crumbled cheese, then bake in a hot oven until the cheese has melted and the potatoes are heated through.'

Leek and Cheese Mash