Skirt Steak Fajitas With Lime And Black Pepper

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Ingredients

2 large onions, peeled and cut lengthwise into 6 wedges, leaving root ends intact
2 1/2 tablespoons olive oil
2 1/2 teaspoons balsamic vinegar
1 1/2 teaspoons salt
1/4 cup fresh lime juice
2 lb skirt steak, halved crosswise
2 1/2 teaspoons coarsely ground black pepper
18 flour tortillas
1 cup fresh cilantro leaves
tomatillo or tomato salsa and lime wedges
metal skewers or a grill basket