1. Peel and trim the beets and onion. Slice very thin, using a mandoline of food processor, and transfer to a large bowl. With the flat side of a knife, crush the garlic cloves and add whole to the beet and onion mixture. 2. In a medium bowl, combine the olive oil, vinegar, honey, salt and white pepper. Pour over beets. Mix well, cover and refrigerate overnight before serving.