This is the heart of any cut of beef against the grain. If it was a pave of rump, it would be the middle / best / heart of the meat / rump, cut against the grain.
Corned beef is derived from cattle (beef), not from pigs (pork). Also, don't mistake 'corned beef' for 'corn-fed beef'. 'Corned beef' is a brine cured cut of beef, whereas 'corn-fed beef' is cattle...
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