Citation not required, but it would likely help make your case...

I was surprised too by this claim, but a quick Google search turned up this tweet on X: https://x.com/McFranchisee/status/1998885781319082342

    > From pretty much day one, the size of a @McDonalds beef patty has been 10:1 (10 patties per pound of beef). It still follows this standard today. Same size. 

    > There are no fillers, preservatives, organs, bones, or anything like that, just 100% pure USDA beef. The box doesn’t even need an ingredient label; it simply states 100% Beef.