Oh yeah, its kind of like how canadian bacon works on "hawaiian" pizzas too. Sweet and salty is a nice combo.
Anchovies are like "the classic fishy smell" turned up to 11 and then put on pizza. I never understood the appeal of them, but apparently they're super popular with the older generations ordering pizza.
Interesting. I'm no fan of seafood on pizza in general, but I'd take the anchovies first here, since they're basically just salt bombs. (Tuna on pizza or over pasta isn't something I can easily stomach even though I love it in other food combinations.)
Have people never heard of a tuna melt? This is just a tuna melt. The only crime here is the pineapple. But I guess if you're into that kind of thing it would probably taste good to you.
Usually tomatoes, but I've had them with tomato sauce too. I can't remember if I've had them with black olives, but I should! They're delicious and would totally improve upon a tuna melt.