In this summery soup, sour cream bolsters the buttermilk’s tang, which in turn plays up the cooling notes of cucumber; celery lends a savory undertone.
In a blender, purée the cucumber, celery, shallots, olive oil, and 1 tsp. kosher salt until smooth. Strain through a medium-mesh sieve into a large bowl, pressing on the solids to extract as much liquid as possible. Whisk in the sour cream and buttermilk and season to taste with kosher salt and freshly ground black pepper. Refrigerate until chilled, at least 1 hour. Serve drizzled with olive oil and garnished with chives.
Make Ahead Tips
You can make this soup up to 2 days ahead.
nutrition information (per serving):
Photo: Scott Phillips