The sandwich is named after its supposed inventor, John Montagu, 4th Earl of Sandwich. There are both savoury sandwiches, such as deli meat sandwiches, and sweet sandwiches, such as a peanut butter and jelly sandwich.
As well as being homemade, sandwiches are also widely sold in various retail outlets and can be served hot or cold. The bread may be plain or be coated with condiments, such as mayonnaise or mustard, to enhance its flavour and texture. Sandwiches are a popular type of lunch food, taken to work, school, or picnics to be eaten as part of a packed lunch. The USDA uses the definition, 'at least 35% cooked meat and no more than 50% bread' for closed sandwiches, and 'at least 50% cooked meat' for open sandwiches. In the United States, the Department of Agriculture and the Food and Drug Administration are the responsible agencies. In the 21st century there has been considerable debate over the precise definition of sandwich and specifically whether a hot dog or open sandwich can be categorized as such. The sandwich began as a portable, convenient finger food in the Western world, though over time it has become prevalent worldwide. A sandwich is a food typically consisting of vegetables, sliced cheese or meat, placed on or between slices of bread, or more generally any dish wherein bread serves as a container or wrapper for another food type.
