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1
Preheat oven to 400 degrees F (200 degrees C). Line a baking sheet with foil.
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2
Cut around the top of the pumpkin to make a lid. Use a large metal spoon to scoop out the inside membrane and seeds.
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3
Place the pumpkin on the prepared baking sheet, and place in the preheated oven. Cook for 1 hour, then lower heat to 325 degrees F (165 degrees C).
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4
Meanwhile, place the sausage in a deep pot over medium-high heat. Cook until evenly browned, turning frequently, 10 to 12 minutes. Stir in the carrots, celery, onion, and garlic; cook and stir until translucent and tender, about 5 minutes. If desired, stir in the parsnips, rutabaga, and/or the cabbage; cook until the vegetables are almost ender, about 5 minutes. Add the red and green peppers, broccoli, zucchini, and corn. Pour in the chicken broth, add the rice, and cook 5 minutes more. Stir in the parsley, red pepper flakes, onion soup mix, and Italian seasoning. Season to taste with salt and pepper.
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5
Keeping the pumpkin on the baking sheet, spoon the vegetable-sausage mixture into the pumpkin, and replace the lid. Loosely cover the pumpkin with aluminum foil.
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6
Cook the pumpkin in the preheated oven until the flesh is tender, about 4 hours. Scoop some of the pumpkin flesh away from the sides to combine with the vegetable mixture. To serve, place the pumpkin on a serving platter, and remove the lid to ladle out the contents.