The Portuguese sauce from Macao is considered to be a legacy of Portugal's colonization of Daman and Diu in India,[1] and is likened to a mild yellow curry.[2]
Despite its name, Portuguese sauce (along with Galinha à portuguesa) is a Macanese cuisine invention, and is not a sauce used in Portuguese cuisine.[3]
^Kwan, Michael (22 March 2016). "Exploring Hong Kong-Style Cafes: Copa Cafe Richmond". Tourism Richmond. Retrieved 6 March 2018. The Portuguese sauce is like a mild yellow curry and it's not meant to be spicy at all.