Preheat the oven to 375 degrees F (190 degrees C). Bring rice and water to a boil in a saucepan over high heat. Reduce heat to medium-low, cover, and simmer until the rice is tender, and the liquid has been absorbed, 20 to 25 minutes. Set the cooked rice aside. Cook onion and olive oil over medium heat until onion begins to soften, about 5 minutes. Transfer half of cooked onion to a large bowl and set aside. Stir tomato sauce, vegetarian beef broth, celery,balsamic vinegar, and red pepper flakes into the skillet; cook and stir for 1 minute. Pour tomato sauce mixture into a 9x13-inch baking dish and set aside. Combine ground vegetarian beef, Italian vegetarian sausage, diced tomatoes, Italian parsley, garlic, salt, black pepper, and cayenne pepper into bowl with reserved onions; mix well. Stir in cooked rice and Parmigiano Reggiano. Stuff green bell peppers with vegetarian beef and sausage mixture. Place stuffed green bell pepper halves in the baking dish over tomato sauce; sprinkle with remaining Parmigiano-Reggiano, cover baking dish with aluminum foil, and bake in the preheated oven for 45 minutes. Remove aluminum foil and bake until the vegetarian meat is no longer pink, the green peppers are tender and the cheese is browned on top, an addition 20 to 25 minutes.Enjoy!
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