Kefir Okroshka (Russian Cold Vegetable Soup)
1. Stir together kefir, green onions, and dill in pitcher or medium bowl. Season with salt and pepper, if desired. Chill at least 1 hour (or overnight).
2. Steam potatoes and carrots in steamer basket over boiling water 7 to 8 minutes, or until tender, but still firm. Transfer to bowl to cool.
3. Add cucumber, radishes, and arugula to potato mixture. Pour kefir mixture over vegetables, and stir to combine.