Oh you can order the pizza with toppings. I think it's the extra sauce that blew their minds....
This particular pizza came from a restaurant on the ancha called Franciscos.
I've eaten there twice, and they have pretty good Italian. In the pizza section of the menu, they are all listed with their toppings for that particular version.
So, now that I think about it, you wouldn't really order a pizza let's say "with onions and mushrooms"
You read the menu, pick out the version that comes closest to what you want, and go with that. If you don't like it, pick it off. But it is what it is. You ordered the xyz pizza, that's what you're going to get.
Getting away from pizza, you can order a meal, lets say a salad and tell them you don't want the green peppers, and they won't put it on. Or an entree without something you don't like. But it seems that's about as far as they can compromise. The mindset, which isn't bad or good, it's just the culture, is "well you ordered this, if you didn't want this, you should have ordered something else. There's plenty of other things you would like."
The key takeaway is flexibility, on the gringos part.
I remember ordering a hamburger at a nice place. I was asked how I wanted it, so I said "medium rare"
It came looking beautiful on the outside, but upon biting into it, it was raw.
I asked to have it cooked more and the waitress took it away, but not before honestly staring at me in puzzlement for a few seconds like "You said medium rare. This is medium rare. Crazy gringa.....and on top of all this, you wanted ice" Don't get me started on ice.
Even though in the US I would be considered to be someone who wants very minimal ice in their drink, there, it's like a person has a mental disorder if they expect more than 2 cubes.
I get that though. Electricity is really cheap there, until you cross a certain level, then the price skyrockets. Restaurants are very aware of their refrigerations costs.
As far as mole, oh Christ I hate mole. Especially when it has chocolate in it.