For the French onion soup with Frankfurter sausages, cut the onions into fine rings and chop the garlic. Fry them in a pan with olive oil.
Then put them in a pot and deglaze with the soup and white wine and simmer for about 15 minutes. Cut the frankfurters into small slices and add them to the soup.
Simmer until the frankfurters are cooked through. Season the French onion soup with frankfurters with salt and pepper.