01 - Heat olive oil and 2 tablespoons butter in a large saucepan over medium heat. Add diced onion and cook until soft, about 3 minutes. Stir in minced garlic and cook 1 minute more until fragrant.
02 - Add Arborio rice, stir well to coat grains, and toast for 1-2 minutes. Pour in white wine and stir until almost fully absorbed.
03 - Add warm broth one ladle at a time, stirring gently and allowing each addition to absorb before adding the next. Continue until rice is creamy and al dente, about 20 minutes.
04 - Remove from heat, stir in Parmesan cheese, and season to taste with salt and pepper. Cover and keep warm.
05 - Pat scallops dry and season both sides with salt and pepper. Heat olive oil in a large skillet over medium-high heat. Add scallops in a single layer without overcrowding and cook 2 minutes per side until golden brown and just opaque in the center. Remove to a plate and keep warm.
06 - Reduce skillet heat to medium, add butter and minced garlic, and sauté for 30 seconds until fragrant. Stir in lemon zest and juice, scraping up any browned bits from the bottom.
07 - Return scallops to skillet, toss gently to coat in sauce, then sprinkle with fresh parsley. Spoon risotto onto plates, top with seared scallops, and drizzle with remaining lemon-garlic butter sauce.