Warm flour tortillas and green chili salsa for serving
Cut pork tenderloin lengthwise into quarters. Cut each quarter into 1/4-inch-thick slices. Combine cornstarch, sherry, cumin, garlic and seasoned salt in medium bowl. Add pork slices; stir to coat.
Heat oil in large heavy skillet over medium-high heat. Add pork mixture; stir-fry 3 to 4 minutes. Stir in onion, bell pepper and tomatoes. Reduce heat to low; cover and simmer 3 to 4 minutes. Serve hot with tortillas and salsa.