- 1 1/2 tablespoons butter
- 2 leeks, halved and thinly sliced lengthwise
- 3 stalks celery, cut into matchstick-size pieces
- 2 carrots, cut into matchstick-size pieces
- 3/4 cup vegetable broth
- 1/4 cup balsamic vinegar
- 3 tablespoons brown sugar
- salt and ground black pepper to taste
- Melt butter in a skillet over medium heat; cook and stir leeks until softened, about 5 minutes. Add celery, carrots, vegetable broth, and balsamic vinegar; cook and stir until vegetables are tender, about 10 minutes.
- Stir brown sugar into leek mixture until dissolved and mixture is lightly browned, about 5 minutes; season with salt and pepper.