Finely chop the onion and place in small glass bowl. Sprinkle with salt and squeeze the juice of one lime over the top. Mix and let sit while preparing the rest of the ingredients. Drain the corn and black beans. Put into large bowl. Wash aroniaberries and add to the corn and black beans. Finely chop tomatoes and jalapenos - removing the seeds of each. (If you like jalapenos, add one or two more; for more of a kick, add one habanero pepper with the seeds removed.) Do not touch your face after chopping the peppers without first washing your hands. Add into large bowl with aroniaberries, corn and black beans. Squeeze the juice from the remaining limes onto ingredients and mix. After mixing ingredients together, add the onions and mix once again. Let chill for an hour before serving with tortilla chips.