Wash the potatoes and cook for about 20 minutes. Defrost the peas. Peel and finely chop the onions. Heat the fat. Steam onions in it until transparent.
Add flour and sauté. Deglaze with 1/2 litre water and cream. Dissolve stock in it. Let the sauce simmer for about 5 minutes. Wash the herbs and chop, except for something to garnish. Stir peas, diced ham, cheese and chopped herbs into the sauce. Season to taste with salt and pepper. Quench potatoes cold and peel off the skin. Put the potatoes in an ovenproof dish and pour the sauce over them.
Stir peas, diced ham, cheese and chopped herbs into the sauce. Season to taste with salt and pepper. Quench potatoes cold and peel off the skin. Put the potatoes in an ovenproof dish and pour the sauce over them. Bake in the preheated oven (electric cooker: 200 ° C / gas: level 3) for about 20 minutes. Serve garnished with herbs