A tuna melt is classified as what type of sandwich?

A tuna melt is classified as an open-faced sandwich because it typically consists of a single slice of bread that is topped with tuna salad and cheese, often melted under a broiler. The defining characteristic of an open-faced sandwich is that it does not have a top slice of bread, making the ingredients visible and accessible from above. This allows the toppings to be showcased, and the melting of cheese adds an appealing texture and flavor component, enhancing the overall experience of the dish.

In contrast, a closed sandwich would have bread on both the top and bottom, enveloping the filling completely. A sub sandwich usually involves a long roll sliced down the middle and filled with ingredients, while a panini refers to a grilled sandwich made with Italian bread, pressed to create a crispy exterior, which differentiates it from the open-faced style of a tuna melt.