Take the piece of fillet mignon and chop it with a knife till it gets almost minced: do not use the mixer.
Take a pastry ring, medium size, put it on a serving dish and start to fill it with the minced meat helping yourself with a spoon. Remove the ring and keep on preparing the other portion. Cover and live in the fridge while preparing the vinaigrette and the vegetables.
Clean the onions, clean the peppers, take away the seeds, wash them carefully, take a non stick pan, heat it very well and cut these vegetables longitudinally.
Lay down the vegetables and make them get to a good point of brown, turning them once in a while. When they are ready, lay them on a serving dish, season with oil, salt and pepper and live them aside.
Start now preparing the vinaigrette: cut the capers in medium size pieces, put them in a small bowl and add all the other ingredients: oil, a little salt, pepper to taste, Worcester and soya sauces, the green tabasco, the Dijon mustard, the lemon and mix energetically by hand. When the mixture is ready, smooth and shiny put it aside.
Star preparing the dish to be served: take your tartare, put the vegetables aside and season with your vinaigrette.