This refreshing salad features a mix of vibrant spring greens dressed in a tangy buttermilk dressing. The combination of crisp lettuce, tender spinach, and peppery arugula creates a perfect balance of flavors. The creamy buttermilk dressing adds a delightful tanginess, while the addition of fresh herbs and lemon zest brings a burst of freshness. Serve this salad as a light and healthy side dish or add grilled chicken or shrimp to make it a satisfying main course.