Peel onions, halve them according to size and cut them into thin rings. Heat the oil in a large pot. Fry the onions until golden brown, turning them over. Dust with flour and sauté. Stir in 2 1/2 litres of water and stock, bring to the boil. Let everything simmer for about 15 minutes at mild heat.
Grate Gouda finely. Stir Gouda and processed cheese in flakes into the soup. and melt while stirring. Season soup with pepper and salt if necessary. Wash parsley, dab dry and cut into strips. Sprinkle over the soup and serve
With 12 people: