Lentil- and Rice-Stuffed Peppers

In a 3 1/2- or 4-quart slow cooker combine carrots, celery, lentils, brown rice, brown sugar, mustard, and salt. Stir in broth and the water.

Cover and cook on high-heat setting for 3 to 3 1/2 hours. Stir in tomato sauce and vinegar. Cover and cook on high-heat setting for 30 minutes more.

Halve sweet peppers lengthwise; remove seeds and membranes.* To serve, spoon lentil mixture in and around pepper halves. If desired, sprinkle with parsley.