Fry the cut oxtail in hot oil with the bay leaves until the meat has turned color.
Add vegetables and fry them for a few minutes. Salt and pepper. Deglaze with the red wine and the stock and cook everything gently over low heat for about 1 ½ hours.
Top with gremolata, consisting of lemon zest, chopped parsley and garlic. Cook in the now closed pressure cooker for another 30 minutes.
If you want an even darker sauce, simply crumble a slice of pumpernickel into it.
Simmer for the first 90 minutes with the lid loosely in the pressure cooker, otherwise the taste will be lost.