In a large saucepan, heat broth and butternut squash puree over medium-high heat. When it boils, reduce heat to a simmer and maintain over low heat, taste for salt and adjust as needed.

In a large heavy saucepan over medium heat, heat oil or butter until melted. Add shallots, garlic and rice; saute until the rice is well coated with oil or butter, about 3 minutes. Add the wine and sage and stir until it is absorbed.

Add a ladleful of the simmering stock; wait until it is absorbed before adding another ladleful stirring gently and almost constantly. Stirring loosens the starch molecules from the outside of the rice grains into the surrounding liquid, creating a smooth creamy-textured liquid.

Continue this process until the rice is creamy, tender to the bite, but slightly firm in the center and all the stock is used, about 25-30 minutes from the time you started.

When all the liquid is absorbed, stir in the grated cheese and remove from heat. Serve immediately and top with baby arugula and extra grated cheese if desired.