How to Make It
Stir together olives, chile, lemon zest and juice, 1 tablespoon oil, and ¼ teaspoon pepper in a small bowl.
Heat 4 tablespoons oil in a large skillet over medium. Add leeks, garlic, ¾ teaspoon salt, and ¼ teaspoon pepper and cook, stirring occasionally, until softened, 12 to 16 minutes. Divide mixture among plates. Wipe skillet clean.
Heat remaining 1 tablespoon oil in skillet over high. Season scallops with remaining ½ teaspoon salt and ¼ teaspoon pepper. Add scallops to skillet and cook, flipping once, until golden brown and mostly opaque, 1 to 2 minutes per side. Serve scallops over leeks with olive mixture and parsley.