Melt sandwich
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A melt sandwich is a type of sandwich consisting of bread, some sort of filling, and a layer of cheese, often grated. The sandwich is then grilled or fried until the cheese is melted. It may be served as an open face sandwich or a closed face one.
One common filling is tuna, with or without mayonnaise; the result would then be a tuna melt sandwich (though, due to tuna's high mercury levels, salmon can be substituted). Ham is another popular choice.
The filling is what establishes the melt sandwich as a variation of the grilled cheese sandwich.