2 fennel bulbs (thick base of stalk), stalks cut off, bulbs sliced
Olive oil
Balsamic vinegar

Preheat oven to 400°F. Rub just enough olive oil over the fennel to coat. Sprinkle on some balsamic vinegar, also to coat. Line baking dish with aluminum foil. Lay out piece of fennel and roast for 15-20 minutes, until the fennel is cooked through and beginning to caramelize.