Melt 2 tablespoons of the butter in a large saucepan over medium heat. Add the onion and garlic and cook, stirring occasionally, until the onion is softened, about 5 minutes.

Add the rice and stir constantly, for 2 minutes.

Add the wine, reduce heat to medium, stirring frequently, until the liquid is absorbed

Add the broth, 1/2 cup at a time, stirring frequently when you first add it and waiting until it is completely absorbed before adding more. This should take about 30 minutes total.

Remove from heat. Add the salt, pepper, Parmesan, and remaining butter, and stir until the butter melts.