Roasted Tomato Basil Soup

Name: Roasted Tomato Basil Soup
Ingredients: 3 pounds ripe plum tomatoes, cut in half lengthwise; 1/4 cup plus 2 tablespoons good olive oil; 1 tablespoon kosher salt; 1 1/2 teaspoons freshly ground black pepper; 2 cups chopped yellow onions (2 onions); 6 garlic cloves, minced; 2 tablespoons unsalted butter; 1/4 teaspoon crushed red pepper flakes; 1 (28-ounce) canned plum tomatoes, with their juice; 4 cups fresh basil leaves, packed; 1 teaspoon fresh thyme leaves; 1 quart chicken stock or water