Bring a large pot of salted water to a boil. Hold the mackerel with your fingers and pour the oil from both cans into a large skillet or Dutch oven. (Some bits of fish are OK. If you’re using fish packed in water, add ¼ cup oil to the skillet.) Set over medium-high heat. When sizzling, add the scallions and capers, and cook, stirring once or twice, until charred in spots, 3 to 5 minutes. Remove from heat, add the sliced vegetables and ½ teaspoon salt, and stir to combine. Set aside until the noodles are ready.
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