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The bagna cauda sauce can be made 1 day ahead. Cool, then cover and refrigerate. Rewarm before using.
Meanwhile, preheat oven to 200 degrees F.
Sprinkle the fish with salt and pepper and brush both sides of the fish with remaining 2 teaspoons extra-virgin olive oil. Working in 2 batches, fry the fish until just opaque in center, about 3 minutes per side. Transfer fish to platter. Cover with foil and keep warm in the oven while cooking the second batch of fish. Drizzle the sauce over and around the fish and serve.