Begin by heating your chicken broth in a medium saucepan over low heat, keeping it warm throughout the cooking process. Finely chop the onion and mince the garlic while the broth warms.
In a large skillet or heavy-bottomed pan, heat 1 tablespoon of olive oil over medium heat. Add the chopped onion and sauté until translucent and soft, about 3-4 minutes. Stir in the minced garlic and cook for an additional 30 seconds until fragrant.
Add the Arborio rice to the pan with the onions and garlic. Stir constantly to coat the grains with oil and toast them lightly for 2-3 minutes to develop a nutty flavor.
Begin adding the warm chicken broth one ladle at a time, stirring frequently. Wait until the liquid is mostly absorbed before adding the next ladle. Continue until the rice is tender but still has a slight bite, about 18-20 minutes.
Once the rice is cooked, turn off the heat and stir in 2 tablespoons of unsalted butter, the grated Parmesan cheese, and the lemon zest. Season with salt and pepper to taste, then cover and set aside.
Pat the scallops dry with paper towels. In a separate skillet, warm 1 tablespoon of olive oil and 1 tablespoon of butter over medium-high heat. Add the scallops, ensuring they aren’t touching, and sear for about 2-3 minutes on each side until golden and cooked through.
Squeeze fresh lemon juice over the seared scallops and swirl the pan to coat them in the buttery lemon sauce. Remove from heat immediately to prevent overcooking.
Spoon the creamy risotto onto plates or a serving platter. Arrange the lemon butter scallops on top and garnish with freshly chopped parsley. Serve immediately.