Slowly caramelized fennel and onion make a simple pizza topper (try the on our Fontina, Fennel, and Onion Pizza) or a condiment on their own.
In a large skillet with a tight-fitting lid, heat extra-virgin olive oil over medium-high. Add fennel and onion, and season with coarse salt and ground pepper. Cook, stirring occasionally, until mixture begins to brown, about 5 minutes. Reduce heat to medium, cover, and cook 5 to 7 minutes. Uncover, add 1 tablespoon water, and cook, stirring constantly, until golden brown and soft, 2 minutes.