Preheat the oven at <temperature>240<unit>°C</unit></temperature>

Mix <quantity>3<unit>tbsp</unit></quantity> of mustard, <quantity>¼<unit>cup</unit></quantity> of Worcestershire sauce, salt, and black pepper to taste in a large bowl

Coat a whole <quantity>1<unit>kg</unit></quantity> eye of round roast with the mixture. Cover and let in rest in the refrigerator for 2h to marinate

Sear all sides of the meat on a skillet over high heat, adding vegetable oil as needed. Transfer the seared meat to a roasting tray

Cover with aluminium foil and roast for 10m

Let it cool down and refrigerate until cold

Thinly slice the meat. The roast beef is ready

Enjoy!