A sandwich occurs as food item typically consisting of 2 slices of bread between which are placed 1 or even thomas more shells of meat, vegetable, cheese, or even more fillings, together sustaining optional or traditionally provided condiments, sauces, and more accompaniments. A bread is typically either lightly buttered, covered in the flavoured oil when baked, or oil is added into a sandwich to enhance flavour.

Sandwiches come normally carried to operate or even school within lunchboxes or dark brown sack (sandwich bags) to be eaten when a midday meal, taken on picnics, hiking trips, or more backpacking. It is likewise served within numbers of eating place when entrées, & come another time eaten home, either as a quickly meal or as section of the big meal. When the shcome of a to the full meal sandwiches are traditionally accompanied using such entremots as a serving of soup (soup-&-sandwich), the salad (salad-and-sandwich), or even potato chips and the pickle or coleslaw.

Variations
A term "sandwich" has been expanded—especially in the United States—to include items mass produced using more "breads" like tortilla, rolls and focaccia. So hamburgers and "subs", for example, come known as "sandwiches" in the United States, although non in the middle west, south or even even american states or virtually all more English-speaking countries (since it is non processed using slices of bread from either the loaf).

A closest traditional Scandinavian equivalent is generally known elsewhere as an "open" or even "open-face" sandwich, i personally.e. one slice of bread using meat, fish, cheese, etc. as a topping, although a sandwich by owning deuce slices of bread has be extra bromide within recent days. This open-face variation is besides prevailing within Russia, where these are referred to as the buterbrod (бутерброд, from either a German word for "buttered bread").

Inside India, sandwiches are typically vegetarian, a usual nature and severity existence the vegetable sandwich.

In the UK, particularly in the north of England they are known, informally, as 'butties' or even 'sarnies'. This is particularly a example sustaining sandwiches including freshly-cooked bacon and butter, though other forms of 'butty' utilise more ingredients & mayonnaise. The sandwich filled by owning chips (US: french fries) is referred to as the 'chip buttie' (besides butty). Inside French countries professional people may watch this known as un Belge: the Belgian (sandwich). An additional informal English title is 'sarnie'. Inside Scotland, sandwiches are known as 'pieces'. Of these Australian slang term for sandwich is 'sanger'. Inside South Africa sandwiches are for instance known as 'sarmies'.

Origin
A sandwich was known as fallowing John Montagu, 4th Earl of Sandwich, an 18th-century English aristocrat, although it is unbelievable to keep close at hand been invented by him. These are said that Lord Sandwich was fond of this form of food because it allowed him to prove my point gambling while eating. A title of the earldom comes from either that of the English village of Sandwich in Kent—from the Old English Sandwic, meaning "sand place".

Now a few types of sandwich come as well unmanageable to become held around 1 hand, so defeating Montagu's original purpose, & must become eaten by having the knife and fork, or at least by owning each mitts. Around occasionally countries these are considered proper universally to apply cutlery to eat sandwiches.

Industry
Based on data from a Washington Post, the USA sandwich business was worth $105 billion US around sales inside 2003, sustaining the 6% annual incubation.

British Sandwich Week, organised per British Sandwich Association which represents a sandwich industry in the United Kingdom , occurs on the week beginning on the second Sunday of May. Inside numbers of economically disadvantaged regions of Engl& and Wales a sandwich is the just school provided luncheon for people students world health organization can't afford to purchase their have luncheon.

Mathematics
A sandwich theorem, frequently utilized inside calculus and real analysis, states that if the real-valued function (the filling) lies everyplace between 2 more real-valued functions (the bread) which each converge to the equivalent limit, then a "middle function" too converges to it limit.

A ham sandwich theorem can be used to prove mathematically that a single cut could divide deuce pieces of bread & a filling apiece exactly around half.

Examples
Sandwiches deviate greatly each in their style—how else it is collectively—& their fillings. Non each style may be utilized using each filling.

Sandwich styles
Aram sandwich Filled baguette Bacon butty Bun Burger Burrito Chip butty, is a sandwich that has french fries in it Club sandwich Grilled cheese Döner kebab Georgia Hots Melt sandwich: Tuna melt, etc. Open sandwich, also referred to as "open face sandwiches". Traditional around many area of Europe, especially in Scandinavia. In a United States the open face sandwich is normally served open face by having warmly meat (beef, turkey, ham) and covered with gravy. Panini Po' boy Submarine sandwich Taco, is a "soft" or even even deep-fried corn or flour tortilla folded within half on top a ingredients Tea sandwich, are flyspeck sandwhiches ordinarily reserved for entertaining Toasted sandwich, is toasted under a broiler or in the toaster oven Torta Wrap

Fillings
Bacon Banh Mi, Vietnamese sandwich Barbecue -shredded meat in BBQ sauce BLT sandwich (Bacon, Lettuce, and Tomato) Cheese (often served by having pickle) Cheesesteak Chicken Coronation chicken Crab Croque Madame Croque Monsieur Cuban sandwich Cucumber sandwich Egg sandwich fried, scrambled, egg salad Peanut butter and Marshmallow Fluff, called the Fluffernutter French Dip sandwich and Italian beef sandwich Grilled cheese Gyros Ham Ham and cheese Hamburger or other ground meat patties, e.g.: Big Mac of McDonald's Whopper of Burger King Hot brown Hot dog or other sausages Jam sandwich Monte Cristo sandwich Muffuletta Peanut butter and jelly sandwich Nutella and other chocolate spreads Pork Potato chip sandwich, classic American "White trash" or "Trailer park trash" cuisine Reuben Roast beef Shrimp Shawarma SPAM - fried, with mayo or Miracle Whip Steak Tuna and Mayonnaise often with added Sweetcorn Vegemite sandwich Vegetable sandwich