Roasted Green Bean, Red Onion and Beet Salad

Name: Roasted Green Bean, Red Onion and Beet Salad
Yield: 10 Servings
Ingredients: 10 large beets, trimmed; 6 tablespoons extra-virgin olive oil; 8 teaspoons chopped fresh thyme; Nonstick vegetable oil spray; 4 red onions, each cut into 6 wedges; 2 1/2 pounds slender green beans, trimmed, cut into 3-inch lengths; 1/4 cup water; 3 tablespoons balsamic vinegar