AKA, "Where's the beef?" ... that's what some of Donald Trump's most fervent -- and possibly hungry -- supporters are reportedly asking after his visit to Miami's famed Versailles Restaurant.

You'll recall, shortly after his court appearance Tuesday to face the 37-count federal indictment, Trump made a stop at the Cuban restaurant, where he was greeted with cheers and "Happy Birthday" wishes. During his fairly triumphant, all things considered, pit stop, Trump yelled out ... "Food for everyone."

However, according to the Miami New Times, Trump left without picking up a single tab for anyone, outside of his campaign team. Now, it's not a "chew and screw" case, he simply never gave anyone time to order ... according to the report.

A Trump spokesperson has a much different view of what went down, or didn't, that day ... telling the NY Post, "At the end of President Trump’s visit he offered to buy food for the group of attendees inside the restaurant, but when President Trump left, the attendees followed him outside and did not place orders themselves."

Translation: You snooze, you lose! Trump was reportedly only inside the restaurant for about 10 minutes.

BTW ... Trump's senior adviser Jason Miller showed off some of the grub the campaign staff got for the road, boasting on social media, "Takeout, Versailles edition!"

Trump himself reportedly ate McDonald's later. Naturally.

All in all, nothing worth a fresh Grand Jury -- just a campaign promise that allegedly came up a little short.