I can imagine this combination of sweet and salty flavors in the coffee, when we prepare some sweet usually by adding a little salt sweet flavors are intensified providing an exquisite result to taste the food, the place is lovely beautiful photographs.
It looks like they just used some salt to make salty caramel on top of the coffee. Combined with the sweet condensed milk, it gives the coffee a more robust flavor. :)
Thanks for stopping by :)
Yummy 😋