Given that you probably eat a balanced diet/meals the rest of the time I am reasonably sure that one night of having dessert for dinner and dessert is not going to mess up anything in the grand scheme XD

_{I would have totally just gone straight there bypassing "proper" dinner and we would have done the same thing of paying in cash, we still do the same thing at San Churro's on the rare occasions that we go there even though they have the qr codes conveniently at the table so you can "skip the queue"}