INGREDIENTS
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2 (1/2-inch-thick) slices white onion
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1 (8-ounce) package mini sweet bell peppers
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Cooking spray
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3/4 teaspoon salt, divided
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1/2 teaspoon freshly ground black pepper, divided
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4 (5-ounce) tilapia fillets
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8 (6-inch) corn tortillas
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1 small jalapeño pepper, thinly sliced
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8 lime wedges (optional)