Heat the vegetable oil in a large frying pan. When really hot, add the meat and brown rapidly on all sides, lifting and turning as you brown. Remove the meat to a side plate.
Put the olive oil and onion into a flameproof casserole large enough to receive all the ingredients, and sauté until soft. Add the meat and the thyme and mix well, then pour the wine over. Bring to a boil. Lower th