Combine the first 11 ingredients. Place 1-1/3 cups lentils in each of four 12-oz. jelly jars. Evenly divide onion mixture among small cellophane bags; place sealed bags inside jars, on top of lentils. Store in a cool, dry place up to 6 months. Yield: 4 batches., To prepare one batch: Rinse lentils and drain. In a large saucepan over medium-high heat, saute carrot and celery in oil until tender. Add lentils, onion mixture and broth. Bring to a boil. Reduce heat; simmer, covered, until lentils are tender, 10-15 minutes.