The secret...or my secret to ANY good beef roast:
1.)Unwrap from vac pac - rinse and pat dry
2.) Put on rack over a sheet pan in fridge with a clean kitchen towel on it for 3 to 5 days depending on thickness and desired beefiness.
If the towel becomes saturated, replace with a new one.
3.) Pull from fridge, remove towel, rub roast with 2 TBS (or more depending on roast size, it should be shiny) vegetable or other neutral oil, season with salt and pepper generously (montreal works well too) place in roaster, place thermometer in the thickest part of the roast.
4.) Place in COLD oven and set temp to 350 for 30 minutes
5.) Turn to 250 after 30 minutes and cook until thermometer reads 118
6.) Pull from oven at 118, turn oven to 500 (550 if your oven will hit it) place roast on large cutting board on counter and tent lightly with foil allowing some air space 30 minutes. Temp will rise to 130 - 133
(Start your mashed potatos boiling now)
7.) When temp stops rising on the roast return to pan and put back in the oven uncovered for 15 minutes to develop the perfect crust! Pull at this point back to cutting board.
You can at this point use the pan drippings and deglaze with a nice red wine, i like cabernet. Place roaster over burner on medium high heat until it starts to sizzle / cook, throw in 3 gloves minced garlic, cook 30 seconds until fragrent, take three sage leaves and roll them in your hands to help the oils break through and dump 1 cup wine into the pan and scrape up bottom pan also known as fondt into the wine. You can add beef stock or base to the wine for a beefier tasting jus.
8.) Slice, serve and eat!
This will be a quite rare roast, for those who like it more well, after i slice it, i rest in the jus until desired temp is reached