G will only have it warm to.
I cook with it, I make things like scones, fish pie, fish sauce, mushroom sauce etc. I just use normal receipes, but substitute the milk for his.
If you phone nutramigen they will send you a receipe book for things like custard, yogurts, ice cream etc (they did me anyway) if not i'm happy to share some recipes if it'll help. I'll dig it out and see what's in there
Have you tried favouring it? Try adding some nesquick milkshake powder to see if that will help the taste or coco powder. Luckily we have never had to flavour. Or mixing it with EBM like you would to introduce cows milk. Upping the amount of power you put in each time.
Don't upset yourself though, send lots of ((((hugs))))