After 6 years of searching I have found it
I am over the moon!
My dog isn't too fussed about food in general. She is healthy and fit, but rather on the skinny side. She usually only eats when she's really really hungry!! But not this time. She could have eaten twice as much if I'd let her, but I didn't wanna overdo it at the start. The pieces are a good size (1cm triangles). The mixture is great, gives you a really confident feeling.
I'm gonna stick with it from now on :))