Perfect Risotto

Ingredients

• 6 cups (1.4 l) low-sodium chicken broth
• 1⁄8 teaspoon saffron threads (optional)
• 2 tablespoons olive oil
• 2 shallots, finely chopped
• 11⁄2 cups (about 14 ounces/395 g) Arborio or Carnaroli rice
• 1⁄2 cup (120 ml) dry white wine
• 3 tablespoons unsalted butter, at room temperature
• 1 cup (100 g) grated Parmigiano-Reggiano, plus more for garnish
• Sea salt
• freshly ground black pepper