Great Burger

My local Super C supermarket had some large rather fancy
Italian hamburger buns on weekly special, so I bought some,
along with a can of tuna, to make a tuna burger for dinner.

The package on the buns suggested that, once the burger assembled,
one should wrap it in foil and put in on the grill for 5 minute.
So I did, in a 425°C oven. As promised, the bun became warm and soft on
the side, and slightly crisp on the outside. Even the burger was less stiff than
usual. A really good idea...