¼ cup plain dried bread crumbs
Combine the lentils, wine, water, carrot, celery, onion, bell pepper, garlic, and bay leaf in a large saucepan. Cover and simmer over medium-high heat until the lentils are tender and the liquid is absorbed, about 30 minutes.
Meanwhile, preheat the oven to 350° F. Lightly oil an 8-by-10-inch baking pan. Bring a large pot of water to a boil over high heat; add the zucchini and cook for 15 minutes, until just tender. Drain and cool slightly.
Trim the ends and slice each zucchini in half lengthwise. Use a spoon to scoop out about half of the inside of the zucchini, leaving a ¼-inch thick shell. Arrange the zucchini shells in the prepared pan and sprinkle with salt and freshly ground pepper.
When the lentils are cooked, remove the bay leaf. Stir in the remaining ingredients, except the Parmesan and bread crumbs.
Stir together the Parmesan, bread crumbs, and a dash of pepper in a small bowl.
Spread about 2 tablespoons of the lentil mixture into each zucchini half. Sprinkle with the Parmesan mixture.
Bake for 30 minutes or until the zucchini are completely tender and the cheese is melted.