This sauce is delicious tossed with pasta and a handful of Parmesan. You can also spoon it onto toasted baguette slices and serve as a crostini.
Preheat oven to 450 degrees. In a 9-by-13-inch baking dish, toss together fennel, tomatoes, wine, oil, thyme, and pinch of sugar. Season with salt and pepper. Bake, tossing occasionally, until fennel softens and pan juices thicken, 35 to 40 minutes.