Instructions: In a 3 1/2, 4, or 5-quart crockpot, combine carrot, celery, dry lentils, uncooked brown rice, onion, garlic, brown sugar, and mustard. Stir in vegetable broth. Cover and cook on low heat for 8 to 10 hours or on high heat for 4 to 5 hours. Stir in tomato sauce and vinegar, cover and cook for 30 more minutes. To serve, spoon mixture onto buns or rolls.

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