- 2 cups chicken or vegetable stock
- 2 tbsp extra-virgin olive oil
- 2 shallots, finely chopped
- 2 bunches watercress, chopped (including tender stems)
- fine sea salt
- freshly ground black pepper
- 2 medium russet potatoes, peeled, thinly sliced
- 2 tbsp unsalted butter
- 1/3 cup crème fraîche
- 2 tbsp finely chopped fresh chives
- Bring stock to a boil. Meanwhile, in a large saucepan, heat oil over medium heat. Add shallots and cook until soft, about 4 minutes. Add watercress and season with salt and pepper; stir to wilt. Add potatoes and hot stock, bring to a boil, and cook for 2 minutes. Reduce heat; simmer until potatoes are tender, about 8 minutes.
- Purée soup in a blender until smooth. Stir in butter until melted and season to taste with salt and pepper.
- Ladle soup into bowls and top each with a spoonful of crème fraîche and some chives. Serve immediately.