My aunt drank a cup of instant coffee every morning. She was always running late for work. She’d pour some coffee in a saucer and it would cool enough to drink. Of course, this was at home and not in a restaurant.
She drank instant because my uncle didn’t drink coffee. She felt it wasn’t worth making a pot. She only had time to drink one cup. Getting up 15 minutes earlier wasn’t an option for her.
I’ve never seen anyone else cool a hot drink in a saucer. Have you?