Tonkatsu sauce is a Japanese condiment, reminiscent of barbecue sauce, tailor-made for pork tonkatsu. When we say "reminiscent of barbecue sauce" we mean, it's used similarly but is oh-so-much more ...
So you want to make Yukihira's Tonkatsu with Black Cheese Sauce, eh? Just be aware...it takes a LONG time to make and if anything you can make a nice béchamel (cheese sauce) and add some roasted ...