El requesón, llamado en algunos países de América del Sur ricota (del italiano ricotta, y éste del latín recocta, ‘recocida’), es un queso obtenido de un segundo procesamiento del suero lácteo producido como derivado en la elaboración de quesos de pasta blanda, De color blanco, sabor suave y textura blanda y granulosa, es un elemento crucial en la cocina italiana y se emplea para postres y platos salados por igual; es uno de los rellenos tradicionales para la pasta.

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Ricotta (pronounced [riˈkɔtta] in Italian) is an Italian whey cheese made from sheep, cow, goat, or Italian water buffalo milk whey left over from the production of cheese. Like other whey cheeses, it is made by coagulating the proteins that remain after the casein has been used to make cheese, notably albumin and globulin. Ricotta (literally meaning "recooked") protein can be harvested if the whey is first allowed to become more acidic by additional fermentation (by letting it sit for 12–24 hours at room temperature). Then the acidified whey is heated to near boiling. The combination of low pH and high temperature denatures the protein and causes it to precipitate, forming a fine curd. Once cooled, it is separated by passing the liquid through a fine cloth, leaving the curd behind. Ricotta curds are creamy white in appearance, and slightly sweet in taste. The fat content changes depending on the brand and the type of milk used. In this form, it is somewhat similar in texture to some cottage cheese variants, though considerably lighter. It is highly perishable. However, ricotta also is made in aged varieties which are preservable for much longer.

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