Soulistic Tuna and Shrimp is exactly how you described. There's a thin layer of what they call gelee, but which is really jello minus the flavoring and coloring, on top, with big tuna chunks and whole shrimp sort of packed under it. It's at Petco. I haven't tried other gelee ones (they make gravy and gelee, and I got the gelee by accident. the cats love it though) but there are lots of different flavors, and this brand likes to use whole pieces.