A long turn in the oven gives these juicy plum tomatoes good caramelization, lending sweetness to their robust flavor.
Cooks' note:
Tomatoes can be roasted 2 hours ahead and cooled completely, then kept, covered with plastic wrap, at room temperature. Reheat in shallow baking pan in a preheated 350°F oven until tomatoes are heated through, about 10 minutes.
