Pre heat oven to 425°F
Spread a thin layer of Dijon mustard all over the roast. This is what will bind your seasonings.
In a small bowl, combine the salt, pepper and oregano.
Season the roast with the spice mixture.
Place a rack (like a baking cooling rack) on top of a cookie sheet and place the roast on the rack.
Roast at 435°F for 20 minutes, then drop the oven temperature to 300°F for 30 minutes.
Use a meat thermometer to determine doneness. 120 F = rare
126 F = medium-rare
134 F = medium
150 F = medium-well
When at desired doneness, remove from oven, cover and allow to rest and cool.
Do not try and slice your roast while hot or warm. You won't get that deli meat slice.
Cool your roast in the fridge for a few hours before slicing.
Slice against the grain when making your slices.
Add your homemade roast beef deli meat to lunches for your family for the week!
Use within 4 days, and freeze leftovers for up to 3 months.