Haddock and Prawn were also a comedy act in the mid-70s; they had a summer variety show, replacing the Hudson Brothers.
If you study this dish - and I really don’t recommend that you do - you will note that the haddock segments and the mushrooms float on top, suggesting that the tomatoey liquid below is so viscous you would have to poke the bits down. It would be chewable, in the sense that gum is chewable.
The good thing about having a gluey base? You can stuck the prawns in perpendicular, and make it look as if they’re rising out of the muck to assert control over all they see. And if anyone dares appose them, they have a sniper on the corn.