Step 1

Heat oil in a medium pot over medium. Add onion, carrot, and celery and cook, stirring, until vegetables are tender, 6 to 8 minutes. Add sage and tomatoes; cook, stirring, 2 minutes. Add 6 cups water, kale, and beans; season with salt and pepper. Bring to a boil, then reduce to a simmer and cook, partially covered, stirring occasionally, until greens are tender, 30 minutes. Let cool slightly.

Step 2

Transfer 2 cups of soup to a blender; puree. Return to pot; stir in farro and season with salt and pepper. Serve with a drizzle of oil.