Begin by making the Butternut Squash: Preheat the oven to 325 degrees. Cut the squash in half horizontally and scoop out the seeds. Fill the cavities with the rest of the ingredients. Place them on a baking sheet and bake for an hour and 15 minutes or until they're tender. Scoop out a half cup of the flesh and puree in the food processor. Freeze the rest of the squash for another use.
When the squash is about thirty minutes from being done, make the risotto: In a four quart saucepan, bring the chicken stock to a simmer. In a Dutch oven, melt the butter and cook the onion on low heat until it's softened. Add the rice stir until it's well coated with the butter and onions. Add the stock in one quarter cup increments, stirring the rice with a wooden spoon.
Add another quarter cup of stock when the rice begins to stick to the bottom of the pot. Keep adding stock in quarter cup increments and stirring until the rice is slightly tender. You may not need all the stock. Stir in the squash and the Parmesan and serve.