The fat content of ground beef depends on the cut of meat it came from. Regular ground beef—made from less-expensive cuts—contains up to 30 percent fat. Moderately priced ground chuck contains just enough fat to give it flavor and make it juicy. The leanest (around 5 percent fat) is the most expensive and is made from round and sirloin cuts.
Of course you can use French-fried onions instead of the seasoned croutons!