Marinate the roast in olive oil, mustard, Worcestershire, salt, and pepper for at least an hour.
Oven-sear at 500 degrees Fahrenheit for 20 minutes, then roast at 325 degrees until internal temperature hits 130 degrees for medium rare, which takes about an hour and a half. I tried an oven sear but next time I’ll pan sear for a better crust. Use a meat thermoter for best results.
While the roast cooks, whisk eggs, milk, flour, and salt for the Yorkshire pudding. Let it rest for at least 30 minutes.
Preheat a muffin tin with a small amount of oil in each cup at 450 degrees. Pour in the batter and bake for 20 to 25 minutes until golden and puffed. I didn’t preheat the tin long enough, so mine came out a bit sunken.
For the gravy, melt butter in a pan, whisk in flour to make a roux, then add beef drippings and stock. Season and simmer until thick.
Roast or boil the root vegetables until tender. Garnish with thyme before serving.