Stuffed Zucchini

4 medium to large zucchini, halved lengthwise, seeds removed
2 cups cooked white rice
1 lb ground beef
1/2 medium sweet onion
2 garlic cloves, finely chopped
2 14.5 cans fire roasted diced tomatoes, with their juices OR 1 can tomatoes and 1 10oz can Rotel
1/2 tsp pepper
1 tsp salt
1/2 cup Parmesan, grated (optional)

1. Preheat oven to 400
2. In a medium skillet, brown the ground beef, onion and garlic. Drain the meat.
3. In a medium saucepan, bring the tomatoes to a boil, then reduce and simmer for 5 minutes. Remove from heat.
4. In a large bowl, combine the ground beef, rice, tomatoes, salt and pepper, mix until blended.
5. Place the zucchini skin side down on a cookie sheet. Evenly divide the beef mixture among the zucchini halves. Cover the pan with aluminum foil and bake for 40 minutes.
6. Remove the foil and sprinkle the cheese on top. Return the pan to the oven, uncovered, for about 5 minutes until the cheese melts.