In a food processor, pulse the olives, pine nuts, garlic, capers, lemon juice, and white pepper to a chunky paste. Refrigerate until ready to use (can be made a day or more in advance).
Preheat the oven to 425 degrees. Butter a baking dish that will hold all of the fish in a single layer. Place the fish flllets in the prepared dish, and press some of the olive mixture in a thin layer over each piece of fish. Bake for 10-12 minutes, or until the fish flakes easily. Serve immediately.