Serves 1

* 1 teaspoon extra-virgin olive oil
* 1/2 small onion, finely chopped
* 1 carrot, finely chopped
* 1 celery stalk, finely chopped
* 1 garlic clove, minced
* Coarse salt and ground pepper
* 14.5 ounces low-sodium vegetable or chicken broth
* 3/4 cup cooked lentils (from a 15-ounce can), rinsed and drained
* 2 teaspoons red-wine vinegar

Directions

1. In a medium saucepan, heat oil over medium. Add onion, carrot, celery, and garlic; season with salt and pepper and cook, stirring occasionally, until onion softens, 3 to 5 minutes. Add broth; bring to a boil and cook 5 minutes. Add lentils and cook until soup thickens slightly, 3 to 5 minutes. Stir in vinegar and season with salt and pepper.

Reference : marthastewart.com