aigre-doux
/ˌɛɡrəˈduː/(also aigre-douce)
adjective
That combines elements of sourness and sweetness; simultaneously sour and sweet; bittersweet. Frequently of a sauce and in figurative contexts.
Origin
Early 16th century; earliest use found in John Skelton (c1460–1529), poet. From Middle French, French aigre-doux (although this is first attested later: 1541; originally and frequently in figurative contexts) from aigre sour + doux sweet.