Pork Tacos with Onions and Peppers

Name: Pork Tacos with Onions and Peppers
Ingredients: 1 large pork tenderloin (about 1 1/4 pounds), trimmed; 3 tablespoons extra-virgin olive oil; 2 teaspoons fajita seasoning; 2 bell peppers (red and/or yellow), sliced; 2 small red onions (11/2 thickly sliced, 1/2 thinly sliced); 6 radishes, thinly sliced; 2 Persian cucumbers, chopped; 2 teaspoons finely chopped pickled jalapenos (mild or hot), plus 1 tablespoon brine; Kosher salt and freshly ground pepper; 1/2 cup fresh cilantro; Juice of 1/2 lime, plus wedges for serving; 12 corn tortillas, warmed