Mahi Mahi with Cilantro Sauce

Ingredients

• 2 pounds mahi mahi, cut into 4 serving pieces
• 1 large onion, thinly sliced
• Kosher salt and freshly ground black pepper
• 2 to 4 pickled jalapenos
• 2 packed cups cilantro, from about 2 bunches
• 1/3 cup lime juice, from about 2-3 limes
• 2 tablespoons white wine vinegar
• 8 tablespoons olive oil, divided
• 1 lime, quatered

Directions

1. Move the oven rack to the lower middle position, then heat the oven to 350 degrees F. Add two tablespoons olive oil to a heavy-bottomed 12-inch stainless steel skillet and set it over high heat. Once the oil is smoking, add the onions and cook, stirring frequently, until they have softened and the edges are beginning to char, 2-3 minutes. Take the pan off the heat.
2. Spoon half of the onions into a medium-sized baking dish and add the lime juice. Arrange the fish over the onions, then season it with salt and pepper. Scatter the remaining onions over the fish and drizzle with two tablespoons of oil. Cover the baking dish with aluminum foil and bake until the fish is done, checking after 25 minutes and continuing in 5 minute increments if it needs more time.
3. While the fish bakes, put the cilantro, white wine vinegar, and jalapeños in a food processor. Blend until pureed, stopping to scrape the sides with a rubber spatula when needed. With the machine running, slowly pour in the remaining four tablespoons oil, then continue processing until the sauce is smooth.
4. Spoon heaping tablespoons of cilantro sauce onto a plate, then set a fish fillet on top. Do the same with the remaining fillets. Serve with white rice and lime wedges, adding more salt and pepper to taste.