I know that Myndi is no cat, but she is on the canine K/D canned. Miss Priss doesn't do dry. I thought I would have a problem getting her highness to eat it, but so far, so good. With her vet's okay - I add some veggies to the evening meal - just for a change in taste and so she doesn't get bored with it. Vet also said it would be okay to add just a small spoonful of a tastier dog food to it that she liked previously if she starts getting too finicky about it. I do that a couple of times a week, just to keep her interested, since I don't want her to suddenly stop eating it one day, and not fall for the trick of me doctoring it up.
Can you maybe add just a smidgen of something tasty to it to trick them into thinking that they're getting something different?? And I always nuke what has been in the fridge, rather than feeding it cold.