Peel and finely dice the onion. Knead minced meat, onion, egg, breadcrumbs, milk, ##mustard## and season with salt and pepper. Form into 16 small meatballs.
Heat the oil in a pan and fry the meatballs for about 8 minutes, turning them over. Pour beans and ##corn## into a sieve and rinse with cold water. Wash parsley, shake dry, pluck leaves from the stalks and chop, except for something to garnish.
##Chili## wash, clean and cut into fine rings. Carefully mix potato salad, meatballs, corn, kidney beans, parsley and chili rings. Arrange on plates and garnish with parsley.