For the squash purée and stock, cut squash in quarters and scoop out seeds. Place in a large pot with water and salt. Bring to a boil and reduce heat to simmer. Simmer until squash is soft, about 10 minutes. Remove squash with a slotted spoon and place, skin-on, in a blender. Purée until creamy. Reserve 3 cups (750 mL) stock and keep hot. Remaining stock can be stored in an airtight container in the fridge for 4 to 5 days.
1 Acorn squash, 5 cups 1.25 L water, 1 1/2 tsp 7 mL salt
Preheat oven to 350°F`(177°C).
In a large Dutch oven with a lid, add onions, 1 tbsp (15 mL) unsalted butter, grated zucchini, rice, wine, 2 cups (500 mL) squash purée and 3 cups (750 mL) squash stock. Season with salt and pepper. Stir to combine. Cover with lid and bake until rice is tender, 45 to 50 minutes.
1/2 tsp 2 mL salt, 1 cup 250 mL thinly sliced onion, 3 tbsp 45 mL unsalted butter, divided, 1 cup 250 mL coarsely grated zucchini, 1 1/2 cups 375 mL arborio rice, 1/2 cup 125 mL dry white wine, 1/2 tsp 2 mL freshly ground pepper
While risotto is baking, make topping. In a small saucepan, heat oil over medium-high heat. Add sage leaves and fry until crisp, about 30 seconds. Remove with a slotted spoon; drain on paper towel. Add bread crumbs and cook, stirring, until golden, about 1 minute. Remove from heat. Finely crush four sage leaves and mix into bread crumbs.
1/4 cup 60 mL light olive oil, 1/2 cup 125 mL seasoned bread crumbs, 4 large sage leaves plus more to garnish
Remove risotto from oven and stir well. Stir in remaining 2 tbsp (30 mL) butter and cheese. It should have a creamy consistency and will start to thicken as it sits, covered, about 5 to 7 minutes.
1/2 cup 125 mL grated Pecorino Romano cheese
Plate risotto and top with topping. Garnish with extra crispy sage leaves, if using.
4 large sage leaves plus more to garnish