I'll bet it was the butter in the crust.
My cat doesn't really like much people food, but does like to give everything I eat the smell test. She doesn't like wet cat food at all. People food she gets a taste of: butter, cream cheese, sardines and mackerel fillets and tuna, fresh spinach, and lettuce.

Neosporin is scary; but I wonder if, like many cosmetics, it has a fish ingredient?