brown sauce is a strange thing. tomato ketchup is sometimes called red sauce, because it is red. and it tastes of tomato which are also red.
but what is brown sauce meant to be ? it's not described as anything other than brown. sometime's it's called daddy's sauce, but that doesn't help much.
i put brown sauce in the same culinary hole as marmite. yuck yuck yuck.
please admire the 70s lighting on this photo. it was a happy accident (like most of the 70s)