¡Buen provecho! or ¡Que aproveche!, it is something Spanish people in their mid thirties and up (and almost certainly the more elderly Spaniards) may call out to you if you are ever found humbly sitting alone in an outside space having a bite to eat.
It is one of the things that I adore about living in Andalucia, Spain. I’m not sure that the younger generations would be caught saying this, but it is certainly something I have experienced countless times. It always puts a smile on my face and makes Andalucia feel like home to me. The openness of the people, the willingness to chat and the love for all things related to food…
So next time you are caught with a sandwich in your mouth while a Spanish person is walking by and they say something to you that you perhaps don’t understand, it is very likely that they are wishing you a good meal.
I hope that this warm gesture continues on for many years to come. It is the small little things like this in life that add up.