Preheat the oven to 350 degrees F.

Slice the top off the head of garlic. Put it on a large square of aluminum foil and drizzle 1 teaspoon of the extra-virgin olive oil over the exposed cloves. Wrap the foil around and over the garlic. Roast until it is soft, about 50 minutes to 1 hour. Remove from the oven and let cool.

Pour the 2 cans of broth into a saucepan, over low heat, and add 3 cans of water. Bring to a simmer.

In a large, heavy bottomed skillet, heat the remaining olive oil over medium-high heat. Add the onion and saute for 3 minutes. Add the mushrooms, season with salt and pepper, to taste, and cook until the mushrooms release their juices, about 5 minutes. Add the rice and cook for 1 minute to toast.

Add 2 ladles full of hot broth to the pan and gently stir the rice. Cook until most of the liquid has been absorbed. Adjust the heat so that the pan is just gently bubbling. Continue adding broth and stirring until all the broth is used and the rice is cooked but not mushy, about 20 to 25 minutes. Once the rice has absorbed all the liquid and is nice and creamy, stir in the butter, Parmesan and the garlic pulp. Cover and let rest for 2 minutes. Transfer to a serving dish and serve hot.

Reserve 3 cups for the round 2 recipe, Fried Risotto Cakes