Position an oven rack 5-to-6-inches from the heat source and preheat the broiler. Line a rimmed baking sheet with foil.
Toss the garlic, tomatoes and scallions on the baking sheet with 1 tablespoon of the oil until coated and sprinkle with salt and pepper. Broil until the vegetables are charred, flipping them once, 10 to 12 minutes. Set aside to cool.
Slice the pork tenderloin on the bias into 4 long "steaks" and sprinkle all over with 1/2 teaspoon salt and 1/4 teaspoon pepper.
Heat 2 tablespoons oil in a large skillet over medium-high heat until very hot but not smoking. Put the pork steaks in the skillet and cook, flipping once, until well browned and just a bit pink in the center, about 7 minutes per side. Turn the heat down to medium if the skillet starts to get too dark. Put each steak on a plate to rest.
While the pork rests, core the tomatoes, squeeze the garlic cloves from their skins, and chop them both with the scallions to make a chunky relish. Transfer the vegetables and all their juices to a bowl and stir in the vinegar, Worcestershire sauce and remaining 1?4 cup oil. Season with salt and pepper. Serve the relish over the pork with crusty bread for soaking up the juices.
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