To add, that’s the only context I’ve ever heard it used in when working in restaurants (to convey that we can’t sell or offer anymore of a thing). If someone order a lasagna with no olives, no one will say “lasagna, 86 olives”.
Worked in an italian restaurant for a few years. IIRC our lasagna generally had pork sausage, yellow squash, onions, bell peppers, black olives and a bunch of the usual cheeses. Probably had some other veggies too but it’s been a while since I worked there.
It was good lasagna.