Combine pork, 2 tablespoons oil, mustard and tarragon or thyme in medium bowl; stir until well coated.
Heat large nonstick skillet over medium-high. Stir-fry pork for 10 minutes or until browned and cooked through; set aside on separate plate.
Heat remaining 1 tablespoon oil in skillet, cook onion, pepper and carrots for 8 minutes or until tender-crisp, stirring occasionally. Return pork and any accumulated juices to skillet; cook 1 minute until heated through. Stir in hot sauce if desired.