is made from fished or farmed sources that can be maintained or whose future production does not significantly jeopardize the ecosystems from which it is acquired. Presentation Traditionally, sushi is served on minimalist Japanese-style, geometric, mono- or duo-tone wood or lacquer plates, keeping with this cuisine's aesthetic qualities. Many sushi restaurants offer fixed-price sets selected by the chef from the catch of the day. These are often graded as , , , and , with the most expensive and the cheapest. Sushi restaurants will often have private booth dining, where guests are asked to remove their shoes, leaving them outside the room; However, most sushi bars offer diners a casual experience with an open dining room concept. Sushi may be served (sushi train) style: color-coded plates of sushi are placed on a conveyor belt from which diners pick as they please. After finishing, the bill is tallied by counting how many plates of each color have been taken. Newer restaurants use barcodes or RFID tags embedded in the dishes to manage elapsed time after the item was prepared. There is a practice called which entails serving sushi on the naked body of a woman. Glossary Some specialized or slang terms are used in the sushi culture. Most of these terms are used only in sushi bars. : , refers to green tea. in usual Japanese. : Sweet, pickled and sliced ginger, or sushi ginger. in standard Japanese. : "Jewel". Sweet, cube-shaped omelette. in standard Japanese. : "Violet" or "purple" (color). Soy sauce. in standard Japanese. : Toppings on nigiri or fillings in . A reversal of the standard Japanese . : "Compliment". Bill or check. may be used in not only sushi bars but also . or in standard Japanese. : Chopsticks. means the nearest thing to the customer seated. or in standard Japanese. : Contracted form of , also known as Japanese horseradish. : Vinegar rice or rice. It may originally be from the Sanskrit () meaning rice, or . ) or in standard Japanese. : Sweet thick sauce mainly made of soy sauce. in standard Japanese. Etiquette Unlike sashimi, which is almost always eaten with chopsticks, is traditionally eaten with the fingers, even in formal settings. Although it is commonly served on a small platter with a side dish for dipping, sushi can also be served in a bento, a box with small compartments that hold the various