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Optional, sauté celery, carrots, and onions in a skillet with 2 tablespoons of oil until onions are translucent.
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Place all ingredients in the crock-pot (except rice), cover and cook on low for 6-8 hours, or on high for 4-5 hours.
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If using rice, add in the last 45 minutes of cooking.
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Alternatively, cook in a Dutch oven or pot on the stove top over medium heat, for approximately 20-25 minutes.