Saffron and Lemon Risotto From 'One Good Dish'

Ingredients (10)

• 2 tablespoons olive oil
• 1 medium onion, finely diced
• Salt and pepper
• 1 cup short-grain Italian rice, such as arborio, carnaroli, or vialone nano
• Small pinch of saffron, crumbled
• 1/4 cup white wine
• 4 cups chicken broth, heated
• Grated zest and juice of 1/2 lemon
• 2 tablespoons butter
• About 1/4 cup grated Parmigiano-Reggiano cheese