Sweet, earthy beets become a refreshing chilled soup in this easy, flexible recipe. You can serve it pureed smooth or leave it with pieces of the grated beets in the sweet, red broth. Either way, it's chock full of vitamins and entirely refreshing. It makes a delightfully fresh start to a bigger dinner, or a perfectly light and refreshing meal when the weather is beyond hot. A dollop of sour cream or yogurt is optional, of course, but that bit of creaminess and tang is the ideal foil to the sweetness of the beets. Serve with crusty bread to sop up any bit of soup clinging to the bottom of the bowl when you're finished spooning it up.