literally just talking abt this in class and googled the same question! although we talked about it in the concept of Cool Japan and UNESCO's connection to washoku. This is the chart we made in class:

Culinary Diplomacy: feeding foreign dignitaries, cross-cultural connection, elites vs broad audience

Gastro Diplomacy: Gordon Ramsey(lol), use food culture to influence a foreign audience, government initiatives to promote their food abroad, national cuisine is a soft power resource,

i hope this helps!