Watercress Soup
['2 tablespoons (1/4 stick) unsalted butter', '1 medium yellow onion, chopped', '2 quarts low-salt chicken broth', '1 pound russet potatoes, peeled, cut into 1/2" cubes', '4 bunches watercress (about 2 pounds), tough stems trimmed, chopped (about 20 cups)', '1 1/2 teaspoons (or more) fresh lemon juice', 'Kosher salt and freshly ground black pepper', '1/2 cup chilled heavy cream', '3 tablespoons thinly sliced fresh chives', 'divided']
Melt butter in a medium pot over medium heat. Add onion and cook, stirring often, until softened, 5-6 minutes. Add broth and potatoes; bring to a boil over medium-high heat. Reduce heat to medium and simmer, stirring occasionally, until potatoes are tender, about 20 minutes. Remove from heat.
Add watercress to pot; stir until leaves wilt. Let soup cool briefly. Working in batches, purée soup in a blender until smooth. Return soup to same pot. Stir in 1 1/2 teaspoons lemon juice. Season to taste with salt, pepper, and more lemon juice, if desired. DO AHEAD: Can be made 8 hours ahead. Cover and chill.
Whisk cream with a pinch of salt in a large bowl until soft peaks form. Fold in 1 1/2 tablespoons chives.
Rewarm soup gently over low heat. Divide soup among demitasse or small teacups and garnish each cup with a dollop of whipped cream. Sprinkle remaining 1 1/2 tablespoons chives over.
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