Step 1

Heat oil in a large heavy pot over medium heat. Add onions and carrots; cook, stirring occasionally, until softened, 3 to 4 minutes. Add garlic and cook, stirring constantly, until fragrant, about 1 minute. Add tomato paste and cook, stirring constantly, until the mixture is evenly coated, about 1 minute.

Step 2

Stir in broth, water, cannellini beans, lentils, sun-dried tomatoes, salt and pepper. Bring to a boil over medium-high heat; reduce heat to medium-low to maintain a simmer. Cover and simmer until the lentils are tender, 30 to 40 minutes.

Step 3

Remove from heat and stir in dill and vinegar. Garnish with additional dill, if desired and serve.