Prepare dried beans according to instructions (above in blog post). Readymade beans from the can: pour away water of the can and wash the beans well under running water.
Chop the onion into small pieces.
Mix onion, vinegar, sugar, salt, pepper, cumin and oregano with about 0.4 cup {100 ml} of water in the salad bowl, until everything has dissolved.
Mix beans, corn, pumpkin seed oil and pumpkin seeds and possibly garnish with 2 tablespoons chives (or parsley).