Anyone for milk soaked minced beef?
It is quite common to make meat loaf with milk-soaked cubes of bread, but I've never heard of tenderising meat with it. Having said that, some kind of fat is common for marinades (yoghurt for example), so it might work. I'd try it with full cream milk, not half-and-half.

I think the reason for soaking liver in milk is to make the taste milder, as lamb, pork and cow liver can be quite strong tasting.