Definition: In this task, you have to generate the title of the recipe given its required ingredients and directions.
Input: ingredients:  '8 cups water', '1 1/2 teaspoons white wine vinegar', '2 pounds Jerusalem artichokes (also called sunchokes)*', '3 tablespoons butter', '1 cup chopped onion', '1 cup chopped leek (white and pale green parts only)', '2 garlic cloves, chopped', '7 cups (or more) vegetable broth', '1/2 cup heavy whipping cream', 'Ground white pepper', 'Shelled pumpkin seeds, toasted', 'Pumpkin seed oil (optional)', 'Sauteed chanterelle mushrooms (optional garnish)',<sep> directions: 'Mix 8 cups water and vinegar in large bowl.', 'Working with 1 Jerusalem artichoke at a time, peel and place in vinegar water to prevent discoloration.', 'Set aside.', 'Melt butter in heavy large pot over medium heat.', 'Add onion, leek, and garlic; sprinkle with salt and saute until soft and translucent, stirring often, about 12 minutes.', 'Drain artichokes; rinse well and drain again.', 'Cut into 1-inch pieces.', 'Add to onion mixture and saute 5 minutes.', 'Add 7 cups vegetable broth, increase heat to high, and bring to boil.', 'Reduce heat to medium-low, cover, and simmer until artichokes are very tender, about 1 hour.', 'Cool slightly.', 'Working in batches, puree soup in blender until very smooth.', 'Return to pot.', 'Rewarm soup, adding more broth by 1/4 cupfuls if needed to thin.', 'Stir in cream and season to taste with salt and white pepper.', 'do ahead Can be made 1 day ahead.', 'Cool, cover, and chill.', 'Rewarm before continuing.', 'Divide soup among bowls and garnish with toasted pumpkin seeds; top with a drizzle of pumpkin seed oil and some sauteed mushrooms, if desired.', 'Tubers of a variety of sunflower; available in the produce section of some supermarkets and at farmers' markets.'

Sunchoke Soup with Pumpkin Seeds