For the sauce:
1. In a large skillet melt the butter, sprinkle with salt and pepper. Sear the meat on all sides. Place in a preheated 425º oven for 20- 25 minutes. Allow to rest for 10 minutes.
2. Prepare the sauce. In a small saucepan place the vinegar, tarragon, and shallots. Boil the vinegar to 1 tablespoon. Remove the pan from the heat and let cool slightly. Add the water and egg yolks, whisking constantly. Over low heat, whisk in the butter a little at a time until thick and creamy. Stir in the tomato purée. Season with salt and pepper. Keep warm in a water bath. Add the parsley before serving.
3. Cut the meat into thin slices and serve the artichoke hearts filled with the choron sauce.