The chickpea (aka, garbanzo bean). So many vegan wonders does a chickpea hold. You can mash up a chickpea and make a chickpea salad sandwich (with a good dollop of vegan mayo, spices and diced veggies). You can add chickpeas to salads and make hummus from them.
In addition to all of the other beans in the world, chickpeas are a great main event option for vegans. With protein and fiber, they are a standby in the pantry.