Hello I'm new here but I can give you some good advice on this. I'm vegetarian, have been having major nausea (7 weeks out of op) and my dietician thinks its protein related - we will see! I also have a lot of nausea associated with milk products and creamy consistencies. So it sent me on a field trip of sorts and I have some decent products that I've tried that you may like. This is an essay - sorry! But am passing on some advice from a professional and giving my taste buds a voice too. We have a hard time finding quality tasty food and taste is as important as quality to me. I'm Aussie so these are products over here but web search if you have a different location. Here they are:
My favourite one is "Ultra Leaan Protein" (yes 2 'a's in Leaan :)) by "Cybrog" in the wild raspberry flavour. I add 3 scoops to my bottled water = 15gms of protein. This is really just like a cordial - close to a poweraid but maybe a little more artificial sweetener (I could do without some of that personally but its the best tasting overall product so far). The best thing about this is it contains the required amino acids too. It's expensive but worth it for me - 2 bottles of water with this a day = 30gms of extra protein. This was $79.95 AUD a tub of 60 scoops but I am sure I can find it cheaper elsewhere! (??)
My Dietitian gave me a sample of "Formulate" Banana shake mix. Comes in a bottle - just add water (convenient). This has a whopping 35 gms of protein per small bottle. BUT don't expect a shake taste, its watery and really like a banana water flavour. It is pleasant enough though. The down side is that it took me half a day to get down with my sippy sippy status! By then the seeds it contains swelled and at the end I was swallowing expanded chia seeds. Not a big deal but for us guys something to remember. Maybe worth halving before adding water and doing in 2 lots? (this was a free sample, don't know the cost)
I also took it upon myself to try the "Isopure" glass bottles of pre-made 'cordial'. These tasted really crappy but if you can get down one 600ml (actually 591mls! such an odd amount) bottle in small amounts over the day you can nab 40gms of extra protein. It's zero carb too zero sugar. $5.95 a bottle
I picked all these up from the Wexford pharmacy at Murdoch St. John of God hospital complex Western Australia. They have loads of other products too.
Other than this, some complete proteins was recommended so not just baked beans but baked beans on toast /muffin when able is a complete protein with protien and amino acids. Eggs are a complete protein as well. Of course if you are a meat eater, no probs.
Best of luck!!