Drain the can of black beans and place them in a large bowl.

Drain the can of shoepeg corn and add it to the bowl with the black beans.

Chop the purple onion into small pieces and add it to the bowl.

In a separate small bowl, whisk together the olive oil, vinegar, and sugar until the sugar is dissolved.

Pour the olive oil mixture over the black bean, corn, and onion mixture.

Gently toss all the ingredients together until well combined.

Cover the bowl and refrigerate for at least 5 minutes to allow the flavors to meld.

Just before serving, add the feta cheese and gently mix.

Serve with large corn chips.