I learned this at 餃子の王将. I had ordered something, and was asked, 餃子はよろしいですか. I thought answering in the affirmative would mean I would get some, so I said はい, but I ended up without 餃子. That experience taught me how context-reliant that word is. Also, on a somewhat related note, I learned the reading of 生姜 by utterly destroying it when I attempted to read it at a 弁当屋. I think what I said was なまかん. The girl at the counter looked at me like I was an idiot, so I asked her how to read it. Turns out it's しょうが (ginger).