Vacuum seal the roast in a plastic bag and cook it at 136°F (58℃) for 24 hours. When the roast is done cooking, drain the liquid into a small bowl if you’re using it for a pan sauce, au jus, or gravy, and set the roast aside for finishing.
To finish the roast, place it on a broiler pan in a preheated 400℉ (204℃) oven for 15 minutes. Turning it halfway through. The heat from the oven creates a crisp crust on the outside.
Once it comes out of the oven, let it rest for 10 to 15 minutes, tented under foil, before serving.