Sort the spinach, clean and wash it thoroughly. Peel and finely chop the onion. Heat the fat in a saucepan. Fry the onions and spinach, except for a few leaves for garnishing, in it. Deglaze with broth and cook for about 5 minutes.
Wash the meat, dab dry and sprinkle with pepper. Cover with ham and sage leaves. Pin with wooden skewers. Heat oil in a pan. Fry the meat for 5-8 minutes, turning it over.
Coarsely puree the spinach in the broth. Add crème fraiche. Season to taste with salt, pepper and a little nutmeg. Serve garnished with lemon wedges and remaining spinach leaves. Baugette tastes good with it.