RISOTTO WITH MUSHROOMS - Lidia

Ingredients

• 7 cups chicken stock (see here)
• ¼ cup extra-virgin olive oil
• 1½ cups thinly sliced shallots (about 4 large shallots)
• 1½ cups thinly sliced leeks, white and light-green parts (about 2 medium leeks)
• 2 cups Arborio or other short-grain rice
• 1 cup dry white wine
• 1 teaspoon kosher salt, plus more to taste
• 2 pounds mixed mushrooms (white, cremini, shiitake, oyster, chanterelle, etc.), thickly sliced
• ¼ cup chopped fresh Italian parsley
• ½ cup grated Grana Padano
• 4 tablespoons butter, cut into bits