Using a food processor, finely chop the garlic, jalapeno and cilantro. Add the tomatoes and scallions and process until chopped. Transfer the salsa to a serving bowl. Stir in the lime juice and let stand for 30 minutes.
Meanwhile, preheat a grill or grill pan to medium-high. Brush the pork lightly with oil and season with salt and pepper. Cook, in batches if necessary, until grill marks appear, 2 to 3 minutes. Flip and cook for 2 to 3 minutes more. Season the salsa with salt and pepper and serve over the pork.