I like pasta with ketchup. Is that okay?
Have you ever eaten it before?
Yeah, I had some spaghetti with ketchup on it before
Spaghetti and ketchup are both very good! It's fine that you eat them together even if other people think that it is weird.
I'm going to tell people how great it is.
There's nothing wrong with liking different foods and combinations.  Just don't expect everyone to appreciate it as much as you do because they might not be used to it.