Depending on desired quantity: Good sloppy squirt of barbecue sauce or as much as you want to make PB, creamy or chunky, a heaping spoonful or a big ole gob for a large batch Five-spice powder or equivalent Black bean sauce or soy sauce to taste, maybe a little fish sauce or a mashed anchovy
If no barbecue sauce, ketchup, cloves, brown sugar.
We carry a tube of squeeze PB in the car. Hot Chinese becomes Thai with a little PB stirred right in when the dish is served. Hide it tho-- the staff will be offended AND think you are insane, but really, their sesame sauce for cold noodle would work just as well if they could understand what you are SAYING!