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INGREDIENTS
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1 lb beef top sirloin steak
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2 tablespoons fajita seasoning mix
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1 large sweet onion
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cut crosswise into 1/2-inch slices
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1 medium red bell pepper
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halved
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1 medium green bell pepper
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halved
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1 tablespoon olive oil
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4 (8-inch) whole wheat tortillas
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warmed
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Sliced avocado
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optional
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Minced fresh cilantro
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optional
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Lime wedges
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optional