Grilled Chicken Breast Cacciatore

Name: Grilled Chicken Breast Cacciatore
Ingredients: 1/4 cup olive oil; 3 medium onions, sliced; 4 green bell peppers, sliced julienne; 4 red bell peppers, sliced julienne; 3 cups white mushrooms, cleaned and quarter-cut (about 1 pound); 6 large ripe tomatoes, large dice; 2 tablespoons tomato paste; 2 cups tomato juice; 3 tablespoons chopped shallots (about 3 to 4); 3 tablespoons chopped garlic (about 7 to 8 cloves); 1 cup fresh basil leaves, chopped (about 1/2 bunch); 1 cup fresh parsley leaves, chopped (about 1/2 bunch); Salt and freshly ground black pepper; 12 (4 to 5-ounce) boneless chicken breasts; Polenta as an accompaniment, recipe follows; 1 large onion, chopped; 6 tablespoons butter; 8 cups water; 2 cups yellow cornmeal; Grated Parmesan