Pork Tacos with Onions and Peppers

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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