In small saucepan, stir together water and broth; heat to boiling. Add lentils; reduce heat. Simmer 35 minutes, covered, or until lentils are tender; drain.
In medium saucepan, stir together pasta sauce, vinegar and drained lentils; heat to boiling. Reduce heat; cook 5 minutes.
Heat oven to 375 degrees F. Meanwhile, cook pasta according to package directions; drain.
Stir together pasta and about 2 1/2 cups sauce; spread into 11 ? 7-inch baking dish. Spoon remaining sauce over top, covering pasta completely; sprinkle with Mozzarella cheese.
Bake 10 minutes or until cheese melts.
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