Our first night in Nice we walked by a restaurant called Gargamelle, which looks like an

That Friday we asked for a table, but the woman who greeted us replied she was closing. "It's a slow night, so we're cutting out early," she explained.
I asked if she had any ideas for where else we could go. She told us about a bunch of places in the neighborhood, and because of her generous honesty, and how cute the place looked, we resolved to come back another night.
Tonight.
We had a great dinner. I devoured the traditional fish soup which seemed to have a touch of cognac -- a nice twist. My mom had salad with crostini.
As we ate, I considered that I hadn't asked for anything all day and I figured this would be a chance.
Only I was low on inspiration. Under other circumstances, I might have asked her to let me visit the kitchen, or spend a morning with her prepping. But time was tight. It had to be now or never. What could I ask that would have an immediate result? What did I need or want, after such a pleasant meal?
And it occurred to me that in the kitchen, which was slightly visible from where I was sitting, I could seen an older couple barking orders at one another, wearing all black and looking very tense indeed. It takes hard work to put together a meal like this. So why not tell let them know it's appreciated?
I inquired if it's a family owned business - it was - and I asked the waitress/hostess to extend my compliments to the chefs. Her mom and dad.
Gained: expressed my appreciation for a fine meal. Not cutting edge asking or negotiation... but offering a compliment has an immeasurable value of its own.