Place onion in bottom of a 5-quart slow cooker; add roast and 1/2 cup water. Sprinkle 1 package taco seasoning mix over top of roast. Cover and cook on high
5 hours or low 7-8 hrs. Remove roast, and shred with two forks; return to slow cooker, and stir in remaining package of taco seasoning mix. Cover and cook on high for 30 more minutes or until boiling. Heat tortillas according to package directions. Using a slotted spoon, spoon beef mixture evenly down center of each tortilla; top with cheese and desired toppings, and roll up. Can use chicken instead of sirloin meat.
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