Onions peel and chop finely. Peel garlic and chop finely. Peel, wash and chop the potatoes. Heat oil in a pot, fry onions and garlic, add potatoes and peas, fry briefly. Deglaze with broth, bring to the boil, cover and cook for about 1 3/4 hours. Stir several times during the last approx. 20 minutes
In the meantime, wash the thyme, shake dry, put some stems aside for garnishing. Remove the leaves from the remaining stems. Wash the fish, dab dry and cut into 8 slices. Heat clarified butter in a coated pan and fry the fish for 2-3 minutes on each side. Then season with salt and pepper. Keep warm
Melt 50 g butter in a pot, add thyme. Heat the cream. Mash peas with a potato masher and stir in cream. Season to taste with salt, pepper and nutmeg. Pea puree, sprinkle two slices of fish with thyme butter and arrange thyme on plates