Well,in one sense she was right.
Hot cook it in your oven,at about 375º and pull it out at 170º internal.
It will rise another 15º,to 185º.
Wrap in HD plastic wrap,and dbl HD foil,tightly.
Wrap in a sleeping bag,and into the tight cooler for six hrs.
Now,grate up about 8 oz fresh horseradish root,and 1/4 cup bottled prepared horseradish,salt to taste.
Get a loaf of really good,heavy crusted bread.
A jar of really good ,cold kosher dills.
Let your stick of imported butter come to room temp,to butter the slices of bread.
A couple liters of Smokin's fine ,cold homebrew.
About 30 mins,before dining,open the foil,slit the plastic a little,and let it work towards room temp.
Before slicing ,pour off and save the soppin's.
Have your Hobart commercial slicer ready on the kitchen counter.
Slice thinly across the grain,so you can read the newspaper thru it,until you get about 12-15 oz.
Butter up the couple slices of fresh bread,top it, openfaced, with the beef.
Pour about 1/2 cup soppin's over it,add horseradish on the side,and a cold dill.
Set out a fork and an appropriate sharp steak knife.
Uncap and pour the homebrew into a chilled mug.
Put on a little J.J Cale and some Oklahoma Swing,and you've got fine eats.