For this super fresh and aromatic risotto recipe, heat oil in a large, high-sided skillet or saucepan. Brown 1 finely chopped onion, then add the rice and moisten with lemon juice. Add the vegetable, chicken or meat broth ladle by ladle until the broth is absorbed each time, and the rice is cooked through. When serving, sprinkle with grated Parmesan, and garnish with lemon zest.