In the same skillet add wine and reduce slightly for about 2 minutes. Add stock and cream and continue to reduce to 1 1/4 cups, about 7 minutes. Add cornstarch mixture and cook until slightly thickened and mixture has come to a slight boil. Reduce heat and add in pork, onions, tomatoes and lime juice. Cook until heated through, about 1 minute. Season to taste with salt and pepper. Serve over rice and sprinkle with green onions and cilantro if desired.