Peel and halve the onions and cut into wedges. Heat olive oil in a pan. Sauté the onion wedges and place in a large, flat baking dish.
Rinse the pork tenderloin with water and cut into 24 medallions. Brush the ham slices with mustard and sprinkle with pepper. Wrap each medallion with a slice of ham and place on the onion wedges. Mix the cream with the stock, creme fraîche and milk. Stir in the pepper sauce, add the herbs and season with salt and pepper.
Pour the sauce over the meat. Put the pan on the wire rack in the oven. Top / bottom heat 180 ° C (preheated), hot air 160 ° C (not preheated). Cooking time: approx. 45 min.