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The lean roast beef you buy is probably brined/treated in some way to make it more tender.
Fat is so essential for tender meat. It blocks protein fibers from bonding with each other much like the layers of butter in pie crust.
Fat is also flavor.
Deli ham, which is treated/formed/flavored/processed every which way, fine. Deli turkey breast, same deal. But a lean DIY roast beef, done to pink? Even with a deli slicer it's going to be dry/require lots of chewing.
I'd go with a cut with a little better marbling - rump. By the time you roast it to a pink interior a good amount of the fat will be rendered and it should be relatively lean.
There is no free lunch. Without the fat or some serious frankenscience your roast beef will suffer.
If your going to be slicing it thin (a la meat slicer) save a few $$ and look at an outside flat. It is only one muscle so you have consistant grain direction. Cooked low and slow it is nice and tender and has lots of flavour.
__________________ Chef Bob
"Ask not what you can do for your country. Ask what's for lunch?" ~ Orsen Wells (1915-1985)