Saute the garlic and onion in a large skillet until onions are translucent.
Add the butternut squash cubes and season with salt and pepper.
Stir occasionally until the squash is tender but not cooked all the way through (about 5 minutes).
Add the Arborio rice and sage. Stir to combine, then add wine and cook 1 minute longer.
Add 2 cups of broth and bring to a simmer.
Stir slightly; do not over-stir. Cook until the liquid evaporates(about 5 minutes).
Then, add 1 cup of vegetable broth at a time and cook the same way until the rice is cooked and the fluid is absorbed.
Continue to add the vegetable broth, 1 cup at a time, until all the vegetable broth is gone.
Again, cook the mixture down until the liquid is absorbed. Do not over-stir the mixture. This process should take 10-15 minutes.
Turn off the heat and stir in the nutritional yeast, lemon juice, and lemon zest. Stir in parsley.
Now, eat the risotto as is, or go to teh next step to make the risotto cakes.