The international soccer superstar dropped in as a special guest lecturer at the Chaplin School of Hospitality & Tourism Management ... and offered up his recipe for success to the students. And, the video is awesome!

The class -- "The David Grutman Experience" -- is led by hospitality guru David Grutman ... where students learn directly from the hospitality icon himself about "how to succeed in a competitive, constantly changing marketplace."

A big part of the course is teaching students about how to build and sustain a successful brand -- and since David Beckham is doing just that as the co-owner of the new Inter Miami CF pro soccer team, Grutman called him in to share his knowledge.

The 45-year-old talked about the importance of hard work and dedication to one's craft -- but also focused on surrounding yourself with a solid team.

"I try to work harder than everyone else," Beckham told the students ... "But, I also surround myself with great people that also are hard workers."

Beckham also spoke about the importance of giving back to the community and working with young kids.

After the lecture, Beckham said he hoped he inspired some of the students ... especially those who braved the cold 70-degree weather (gotta love Miami!).

Oh, one more thing about the class ... NO BOOKS REQUIRED!

The class outline on the official school website says, "This experiential course will take students from the classroom to Grutman’s clubs and restaurants. No books will be required, but students will need to research topics discussed."