Place the veal roast in the center of a large casserole dish. Combine the dijon, thyme, oregano, salt and pepper and rub on all sides of the roast.
Place the sliced leeks and fennel all around the roast and drizzle with olive oil and additional salt and pepper.
Cook uncovered for around 1 hour and 15 minutes. You should cook a veal roast for 25-35 minutes per pound, depending on how well done you want it. Medium-rare is 145 degree F. Medium is 160 degrees F. Well-done is 170 degrees F.
Remove from the oven and let the veal roast stand for 10 minutes then cut off the butcher’s string or net and slice the roast into 1/2 inch thick servings. Serve with the roasted leeks and fennel.