Cod with Lemon, Green Olive, and Onion Relish
['2 lemons', '1/2 small red onion, very thinly sliced into rings', '1 teaspoon kosher salt plus more', '1/2 cup Castelvetrano or other brined green olives (about 24), coarsely chopped', '2 tablespoons drained capers, chopped', '1 1/4 cups olive oil, divided', 'Kosher salt, freshly ground pepper', '8 (6-ounce) pieces skinless cod fillets', '2 dried red chiles, stemmed, or 1/4 teaspoons crushed red pepper flakes', '1/4 cup fresh flat-leaf parsley leaves']
Finely grate zest from lemons; set aside. Using a sharp knife, cut peel and white pith from lemons; discard. Working over a medium bowl, cut between membranes to release segments into bowl and squeeze membranes to release juices; discard membranes and any seeds. Set lemon segments aside.
Combine onion and 1 teaspoon salt in a small bowl. Let sit 10 minutes. Squeeze onion to remove any excess liquid; add to bowl with lemon segments. Add olives, capers, reserved lemon zest, and 3/4 cup oil; season with salt and pepper and toss to combine. Cover relish and chill at least 4 hours.
Preheat oven to 250°F. Bring relish to room temperature.
Place cod in a large shallow baking dish or roasting pan and drizzle with remaining 1/2 cup oil. Add chiles and turn fish to coat; season with salt. Roast until just cooked through, 30–40 minutes.
Transfer fish to a platter. Mix parsley into relish and spoon over fish.
Relish (without parsley) can be made 1 day ahead. Keep chilled.
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