01 - In a small bowl, combine softened butter, lemon zest, lemon juice, chopped parsley, minced garlic, and pinch of salt. Mix thoroughly until well incorporated. Set aside at room temperature for serving.
02 - In a medium saucepan over medium heat, bring whole milk, water, and salt to a gentle simmer. Watch carefully to prevent boiling over.
03 - Gradually whisk in polenta while stirring constantly to prevent lumps. Reduce heat to low and continue cooking for 15–20 minutes, stirring frequently, until mixture thickens and becomes creamy. Stir in butter, grated Parmesan, and black pepper. Cover and keep warm.
04 - Pat scallops completely dry with paper towels. Season both sides generously with salt and freshly ground black pepper.
05 - Heat olive oil and butter in a large skillet over medium-high heat until shimmering. Add scallops in a single layer without crowding. Sear for 1½–2 minutes per side until golden brown crust forms and centers are just opaque. Remove from heat immediately.
06 - Spoon warm polenta onto two serving plates. Arrange seared scallops atop polenta. Drizzle with prepared lemon-herb butter. Garnish with additional parsley if desired. Serve immediately while hot.