Good question. To give an accurate answer, I must ask why is beef being measured in a VOLUME measurement?
The short answer is 2.12 lbs of 80/20 cooked beef.
The long answer is that beef should be measured by uncooked weight. This is because many US butchers package ground beef with a Meat to Fat ratio. 80/20 is 80% Meat to 20% fat content (by overall weight).
To know the difference of when you should use a liquid VOLUME measurement versus a dry weight measurement, use the following test.
Does it melt or could it boil? - Liquids including: water, milk, eggs, oils, vinegar, wine, soup, butter, ice and juices will boil when you heat it up to it's natural boiling point. Glass, plastics and some metals are actually liquids but are measured by weight in their solid forms.
Cheers
EDIT: I'm sorry, but the above answer is incorrect and I doubt what the person was asking for. Rather than give a long-winded explanation of how you "should" measure beef, etc. Consider the possibility that the person's trying to convert cups to ounces to measure the macros (carbs, protein, etc.) of beef s/he's pre-cooked to plan their diet goals and wants an easy way to measure it out. I am doing the same and answering 2.12 lbs of uncooked beef is ridiculously off and does not answer the person's question at all.
A cup of cooked, drained ground beef contains approximately 4 ounces of beef. A simple food scale is cheap and you can weigh your measuring cup, add your beef or what-not, and the difference is your food weight.
Hope that helps.
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