So there is a long running myth about "complete proteins" that need to be involved in vegetarian diets. They myth states that the proteins in plants do not have all the essential amino acids so the proteins must be paired with certain carbs or something to complete it.
Seeing as plants cannot exist without all the ESSENTIAL amino acids its ridiculous to say that they are missing any. The proteins do not need anything else to be proteins.
I dont know where this myth started but health classes from grammar school to college are teaching and also un-teaching this myth, while livestrong attempts to keep it alive of course.