Cold Zucchini Soup with Cinnamon, Cumin, and Buttermilk

This is a quick and simple soup. It’s a wonderful base to which you can add all manner of things, including cooked shrimp, sautéed mushrooms, or spring peas, to name a few. I often will drizzle on a little fragrant nut oil as a garnish. Serve the soup chilled or at room temperature. We don’t always think about serving soup at room temperature, but it’s a nice variation on a warm day.

The buttermilk commercially available today is not a by-product of butter-making, as it was in the o