Whole Roasted Beet Salad with Orange Moroccan Dressing

The flavor of the beets in this salad is measurably better when you roast them whole; then cut them up. The dressing is only a little sparky, even with the harissa-Tunisian hot chili sauce, available in specialty markets. (It is also good on roasted yams or fennel.) When it comes to looking great on a buffet table, few other vegetables beat out beets.