Instructions: Make the Roasted Poblano-Tomato Salsa: Preheat the broiler. Place tomatoes and poblanos on a rimmed baking sheet. Set the baking sheet as close to the broiler as your oven allows, and broil tomatoes and poblanos until darkly roasted and splotchy black on one side, about 6 minutes. Using tongs, turn, and roast the other side. The poblanos may be completely blistered and blackened before the tomatoes are. If so, remove them as soon as they are done.

Reduce oven temperature to 425 degrees. Separate the onion into rings. On a second rimmed baking sheet, mix together onion and garlic. Roast in the oven, stirring every few minutes, until onions are richly browned and garlic is soft and browned in spots, about 15 minutes. Cool to room temperature.

Cut out the cores from the tomatoes. Peel, discarding skins and reserving any juices; set aside. Remove the skins and seeds from the poblanos and discard. Chop into 1/4-inch pieces and place in a large bowl.

In the bowl of a food processor fitted with the metal blade, pulse onion and garlic until finely chopped, scraping down the sides. Transfer to the bowl with poblanos. Without washing the processor, coarsely puree the tomatoes with their juice, and add them to the poblano mixture.

Stir in canned tomato puree and enough water to give the salsa a saucy consistency. Stir in cilantro and thyme. Season with salt. The salsa may be kept in a covered container in the refrigerator for up to 5 days. (Makes 3 cups)

Preheat oven to 400 degrees. Lightly coat a 9- by 13-inch baking pan with oil; set aside.

Bring a large saucepan of heavily salted water to a boil. Add sliced potatoes, and blanch until nearly tender. Meanwhile, place 1 tablespoon oil in a medium bowl. Drain potatoes thoroughly, and add to bowl with oil; mix to coat. Spread potatoes in the prepared baking pan.

Arrange fish fillets over potatoes without allowing fillets to touch each other. Spoon salsa over the fillets and potatoes. Bake until fish is just done, 10 to 15 minutes. Sprinkle with cilantro, and serve immediately.

This recipe yields 4 servings.

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