1. Preheat oven to 400°F. Lightly oil a 9-by-13-inch baking dish; arrange fish in dish. In a small bowl, whisk 1 Tbsp. oil, 1 Tbsp. lemon juice, salt and 1/4 tsp. pepper. Drizzle vinaigrette over fish. Bake until just opaque in center, about 10 minutes.
2. In a food processor, combine parsley, chives, garlic, scallion, anchovy paste and capers. Add remaining lemon juice and 1 Tbsp. water and pulse until finely chopped. With motor running, add remaining oil. Season sauce with 1/8 tsp. pepper. Spoon sauce over fish just before serving.
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