This is delicious and tangy! And it improves in taste if made ahead, refrigerated, and heated up again! It's not wholly South African, as the idea comes from France, and then there's the soy sauce, LOL! Do use sweet, ripe oranges in season, and please do taste your sauce. Cooks need to adjust such sauces to taste, as one cannot be absolutely precise when giving quantities. The quantities given here worked perfectly for me, but it all depends on many variables. Serve with opposite tastes like simple veggies and brown rice. Prep times INCLUDE reducing the sauce.