"The title says it all - No Fuss Tacos. No fuss, no hassle; slow-cooker, one-dish. So easy!..."
INGREDIENTS
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1 large onion, sliced
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1 (3- to 4-pound) sirloin beef roast, cut in half
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1 (10-ounce) can diced tomatoes with lime juice and cilantro, undrained
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2 tablespoons Mexican seasoning, divided
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16 (6-inch) flour tortillas