Preheat oven to 350°F.

Heat evoo in a large ovenproof pot over medium heat. Add onions and cook, stirring occasionally, for 8 to 10 minutes, until slightly caramelized.

Add garlic, sage and squash and saute until fragrant, about 2 minutes. Add 3 cups broth and 1 cup water, cover and bring to a boil. Remove from heat and add rice, stir well and cover. Transfer to oven and bake for 1 hour if using soaked rice or 80 minutes if the rice was not soaked.

Remove from oven, add 1 cup broth and Parmesan, stir well, add salt and pepper to taste, divide among bowls and garnish with more Parmesan, red pepper flakes and fried sage leaves.