Cut flank steak into 6 portions. In any size crock pot, combine meat, onion, green pepper, red pepper, jalapeno pepper, cilantro, garlic, chili powder, cumin, coriander and salt; add tomatoes. Cover; cook on low for 8 to 10 hours, or on high 4 to 5 hours. Remove meat from crock pot; shred. Return meat to crock pot; stir. To serve fajitas, spread meat mixture into flour tortillas; add favorite toppings. Roll up tortillas.
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