Wash the potatoes and cook covered for about 20 minutes. Then quench, peel and let cool off. Cut the potatoes into slices.
Heat the oil in a large coated pan. Fry the potatoes for about 10 minutes, turning occasionally. Peel and chop the onion. After approx. 5 minutes fold into the potatoes. Season everything with salt and pepper.
Whisk eggs and milk, season with salt and pepper. Pour over the potatoes and allow to set at low to medium heat. Push together from time to time with the spatula.
Dice the ham slices. Serve farmer's breakfast with diced ham. Garnish with gherkin, tomato wedge and parsley.