I would season it lightly, then fry on a moderate heat in butter and olive oil. Do this until lightly browned. Remove to a hot plate and keep warm in the oven.
Deglaze the pan with some white wine and reduce slightly adding a little more fresh black pepper and a good spoon of mustard. English or Dijon. Reduce the heat. Then add some cream to the pan and cook out gently until it thickens.
Take the venison fillet and slice on the diagonal slightly into 'coins'. Pour over the sauce and enjoy. Some capers scattered on top would be nice. Nice done with loin too.
Serve with - well whatever you like really. Braised asparagus? Cabbage? Large glass of strong red
Enjoy