high protein liquid foods

Hi,

Trying to get my father in law to get his appetite back and looking for high protein, nutritious things to tempt him with ... some have suggested a liquid diet since he doesn't want to eat much right now but I'm open to any and all suggestions. He's sick of "Ensure" type drinks as they have a very strong soy taste and he's not into sweet stuff right now...

what about pureed soups? That type of thing?

Let me have your best recipes to tempt the person whose appetite is waning.

Thanks!