01 - Combine cauliflower florets and milk in a medium saucepan. Bring to a simmer, cover, and cook 10–12 minutes until cauliflower is tender. Drain, reserving some cooking liquid.
02 - Add butter to cauliflower and blend until smooth, adding reserved liquid as needed for consistency. Season with salt and white pepper. Keep warm.
03 - Pat scallops dry and season with salt and black pepper. Heat olive oil in a large skillet over medium-high heat. Sear scallops undisturbed 2 minutes per side until golden and opaque. In the last 30 seconds, add 1 tbsp butter and baste scallops. Remove from heat.
04 - Melt 2 tbsp butter in a small saucepan over medium heat, swirling until foaming and golden brown with nutty aroma. Remove from heat immediately to prevent burning.
05 - Spread cauliflower purée on plates, top with scallops, drizzle with brown butter, and garnish with chives, parsley, and lemon zest. Serve promptly.