What plant source is the most complete protein?

Soybeans have been touted as sources of "complete protein." However, the entire concept is actually a myth.

All unrefined foods have varying amounts of protein with varying amino acid profiles, including leafy green vegetables, tubers, grains, legumes, and nuts. All the essential and nonessential amino acids are present in any single one of these foods in amounts that meet or exceed your needs, even if you are an endurance athlete or body builder.