Wrap tortillas tightly in foil. Heat in a 350 degrees oven for 10 to 15 minutes or until warm and soft.*
Meanwhile, in a medium bowl stir together the soy sauce and cornstarch. Trim fat from meat. Cut meat into bite-size strips. Add the meat to soy mixture; toss to coat. Let stand at room temperature for 10 minutes.
Pour cooking oil and chili oil or crushed red pepper into a medium nonstick skillet. Heat skillet over medium-high heat. Stir-fry meat and garlic in hot oil for 1 minute. Add 1/2 cup of the cabbage, the sprouts, and green onions. Stir-fry for 3 to 4 minutes or until meat is slightly pink in center and vegetables are crisp-tender. Remove from heat.
Place the remaining cabbage in the centers of the tortillas. Spoon the pork mixture over the cabbage. Fold the bottom half of each tortilla over the filling; fold in the sides, creating a fan shape. Serve with the plum sauce.