Adapted from www.marthastewart.com
This is fantastic on pizza or as a condiment on brats, sandwiches, crackers, etc. Reserve some fennel fronds for garnish.
1 T olive oil
1 fennel bulb, trimmed, cored, and thinly sliced
1 large onion, halved and thinly sliced
Salt and ground pepper
In a large skillet with a tight-fitting lid, heat olive oil over medium-high. Add fennel and onion, and season with 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.