Especially of a sauce: compounded of sweet and sour; bittersweet.
noun
In Italian cookery: a sweet-and-sour sauce, typically based on a reduction of vinegar and sugar; a dish made with this sauce.
Origin
Mid 19th century; earliest use found in United Service Magazine. From Italian agrodolce (adjective) that tastes both sour and sweet, (noun) a sweet-and-sour sauce from agro sour, acrid + dolce sweet.