I guess sometimes the best way to ask for something is to say nothing at all.
Today I went to our workplace cafeteria for lunch and ordered a tuna wrap on on an “orange” pita from one of the hair-netted wrap makers. She used an ice-cream scoop to shovel around 1/2 of a single scoop of tuna onto my wrap – we’re talking less than 1 oz of tuna fish.
When she asked me what else I wanted on the wrap, I just stared blankly at her, then the wrap, then her again. Then I shot her a vacant blink while mentally trying to poof up my eyelashes. She tried to counter with a “what are you talking about” look, but I wasn’t phased, and she folded and scooped a more reasonable amount of tuna into the wrap.