Curried Lentil-Leek Soup

From Healthy Crockery Cookery:

3/4 c. dried lentils
1 28 oz can crushed tomatoes
1 t curry powder
2 T chopped fresh basil
1/4 t salt
1/8 t ground black pepper
1 leek, thinly sliced
2 14.5 oz cans chicken broth

Combine all ingredients in a 3 1/2 slow cooker. Cover and cook on LOW 6 1/2 to 7 hours or until lentils are tender.