Do you have any of that pepperoni left? Can you persuade anyone else to taste it for you?

If you had several slices, I'd recommend you swish them around in some warm water to see what happens.

Did the pizza have any cilantro in it? I've never heard of putting cilantro in a pizza, but I suppose they might have confused it with oregano or some other herb. I've always thought cilantro tasted a bit like soap. It's an acquired taste.