One of the curry recipes in the book "50 great curries of India" says "Heat the oil in a cooking pot and fry the onions until deep pink." I think I know what it means when a recipe says "until deep brown" (which is what many Indian curry recipes call for), but "deep pink" is a first. Is the recipe simply using red onions or some other variety of onion than the one I'm used to (the ingredient list just says "2 large onions, finely chopped")? Does that make an important difference? Or is the recipe referring to the same stage of cooking as "deep brown" (though that doesn't look very pinkish to me)? Or would "deep brown" onions turn somewhat pink if you cooked them even longer? ...
(For the curious, the recipe is for the "prawns in sweet and hot curry")