Marinate pork fillet for a minimum of 30 minutes and up to 4 hours
Heat small amount of oil in large frying pan over medium heat.
Add pork fillet and cook 10 minutes or until no longer pink in the centre, turning after 4 minutes.
Season with salt and pepper to taste.
Remove pork; keep warm.
Add litchis, sugar and cinnamon to pan.
Reduce heat to low, cook for 5 minutes covered, stirring occasionally.
Add remaining marinade to the pan, heat through for 2 minutes and serve over pork fillet.