1-First, prepare all ingredients as outlined: chop the onion and garlic, measure the rice, dice the pumpkin, and keep the stock warm on low heat. This setup ensures smooth cooking and helps capture the full essence of pumpkin risotto.

2-Next, heat the olive oil and butter in a medium pan over medium heat, then add the onion and cook for about 5 minutes until softened. Stir in the garlic and pumpkin cubes next, cover, and cook for another 5 minutes until the pumpkin softens; gently mash it into a rough puree.

3-Now, sprinkle in the Arborio rice and stir for 1-2 minutes to coat the grains with the flavorful fat from the pan. Gradually add the warm stock, pouring just enough to cover the rice, and stir occasionally as it absorbs.

4-Continue adding stock in increments, about ½-1 cup at a time, until the rice becomes tender and creamy, which takes around 18-22 minutes total. Stir more frequently toward the end to avoid sticking and achieve that signature texture.

5-Once the rice is cooked, fold in the Parmesan, nutmeg, and pepper, then taste and adjust seasoning. Finally, serve the risotto right away, drizzled with aged balsamic vinegar for a tangy finish that highlights the autumn flavors.