Thank you for putting onions on my burger, when I specifically requested no onions.
I also note how you put a note on the box saying “No Sliv O[nions]” to indicate that there are none in the burger.
Fortunately, I checked, and it is a preference – not an allergy. This does, however, happen fairly regularly.. I fear it happens to people who do have such allergies.
Love,
zEkE.
Of course if you are allergic to onions the whole of McDonalds would be inaccessible to you because all of the food is prepped in the same place.