Drain and set aside the black beans. Chop red onions, tomatoes, and cilantro into small pieces.

In a blender add the zest of the lime, juice of the lime, cumin, salt, and olive oil, blend for approximately 2 minutes.

Now combine black beans, tomatoes, onions, and cilantro all together mixing in the mixture from the blender. Let salsa stand 20 minutes then serve with tortilla chips.