Step 1 Marinade the piece of beef fillet in the Balsamic vinegar with the brown sugar and seasoning and leave for one hour.

Step 2 Gently sauté the onion in the butter for 10 mins until softened.

Step 3 Cook the pasta or rice according to the instructions.

Step 4 Meanwhile, heat the oil in a frying pan until smoking hot, sear the fillet tail for about 2 minutes on each side until well browned, then set aside and keep warm.

Step 5 Add the cream, stock and Gorgonzola to the onions and stir in for 2 minutes.

Step 6 Slice the fillet tail into 1cm thick slices and add to the onion. Remove from the heat and season to taste.

Step 7 Serve with the linguine or rice.