1/2 lb boneless beef sirloin steak, cut into thin strips
1/4 large white onion, cut into thin strips
1/2 medium green bell pepper, cut into thin strips
1/2 medium red bell pepper, cut into thin strips
2 slices fresh lime
4 flour tortillas (8-in)
4 tablespoons sour cream
4 tablespoons salsa
1 tablespoon chilli powder
1 teaspoon ground cumin
1/2 teaspoon ground oregano
1/2 teaspoon garlic salt
2 tablespoons water