What kind of dish/pastry consists of white bread with ice-cream or some sort of mousse inside? I found this randomly: 
To me, it distinctively looks like non-sugary bread. It looks like the kind of bun you normally use for making sandwiches, for example put butter and/or cheese inside. It doesn't look like it's &quot;sugary&quot; and intended for being a pastry.
Is this a famous/known &quot;dish&quot;/product/concept?
This is almost certainly Brioche con Gelato, which is Brioche, a sweet and rich bread with gelato a rich ice-cream made with whole milk and sugar.